Easy Medals(spoilers)

[Lizardman]

The Infinite Sword
Build a wind deck w/ 2 or more Gouda, lots of weapons(Terrair works best if you have it), and lots o' wind creatures. Play Whirlwind on a large map and wait until the map is full of creatures and invade one of his territories w/ your Gouda. Give him a good weapon and your set, just make sure he is not holding any Wind Shields when you attack. I was able to do over 300 damage w/ a Gouda equiped w/ Terrair. ;D

The Infinite Shield
Build an earth deck w/ 4 Mudman, 2 or more Dark Masters, a bunch of armor, and a ton of green creatures. Play Gemmory on a large map, fill the map w/ earth creatures and when Gemmory lands on one of your Mudman it will get a large bonus from all her earth creatures and all your earth creatures. Dark Master adds 10 more HP and if you play cards like Diamond Armor, Platemail, etc. on it you should be able to get well over 200HP.

Avaricious Smile
Get out a Boggart or Gnome and level up the territory to level 5. Use Domovikhi or Land Protection to protect the land from other spells. Also use Holy Words to increase the chances of your opponent landing on it. I recommend playing Luthien(rarely invades) on a small map like Dunnan to increase the chance of them landing on it. Remember to set the MP limit fairly high so you don't win too early by having a level 5 territory.

Roar of the Butcher
The easiest way to get this one is to use Energy Flash, not everyone has this card though. I used Goblin's Lair w/ Find to litter the map w/ Goblins then I activated Tempest and was able to wipeout all my Goblins and enough of the opponents creatures to get this medal. I recommend playing someone like Golligan or anyone else who uses idols or weak creatures and play on a large map.

[Ben-Ra]

Also, for Infinite Sword/Shield, buy 200 blue symbols (not that hard if you use Pressure), and use Lung.

[Captain Garak]

These are some excellent tips. I haven't acquired any of these medals yet, so perhaps these hints aren't as "obvious" as they might seem to those who already have them.

Thanks for contributing all of this good stuff! ;D

[armadi]

I got both the infinite sword and shield revisiting Kazatega in story mode using Gouda. Between Whirlwind, Leo and my pretty much all wind medal: Gouda was much larger than 200/200 (well, slightly larger).

[animetric]

I got Infinite Shield with Leoknight. Played on a large map against Morroc.

[MisterScratch]

I got the infinite sword by using Soul Collector (just like the medal shows), in any reasonably long game, he should get well above the 200 STR required (I maxed out at 475 STR on the heavenly altar map in story mode). You don't need to worry about using any items or other cards.

[Culd Fusion]

An even easier way to snag Avaricious Smile is to have the Gnome on a level 5 land, and then cast Quicksand on it when there's an opponent approaching.

I don't have Energy Flash yet, so I snagged Roar of the Butcher with a similar method to the one posted above. I started by loading my deck with creatures of 40 MHP or less. Tempest would have worked nicely, but I still don't have any of those either, so I substituted it with Catastrophe (which halves all creatures' HP), along with some Insect Swarms. I played on Cratos 2, against 3 opponents (all out for ourselves, not on teams) thereby filling the board with monsters. When the time was right, I hit everybody with Catastrophe leaving most of the creatures with 20 or less HP, then used the Insect Swarm (which does 20 damage to all wounded in an area) to finish the job. There was much carnage.

[WhoseYerLilith]

I got the sword and shield medal together after Kazatega- At that point I was experimenting with a yellow deck and was pleasantly surprised to see that Whirlwind used an all yellow deck too- Ryvern also uses yellow creatures. My yellow deck consists of three Goruda's--I placed two luckily and kept one in my hand for offense, then Whirlwind, Ryvern and myself continued to place Succubi, Wendigos, Griffons, Monks, Knights, Wyverns and Gremlins. I landed on Ryverns Lv 4 Land with an attack and defense power of 280- his gremlin didnt have a chance.

[ShadowoftheLord]

Gotta say Roar of the Butcher was fairly easy. I played against Goligan, at he Heavenly Alter. I used Powder Eaters, the when I knew I had enough. Bham. Along came a Death Cloud that wiped them all out . 20 to all wind creatures. Hope this helps.

SotL

[chaim79]

Roar of the Butcher does sound way to easy, using powder eaters or goobas that is... very simple to fill the map with whatever then kill them all with the spells against whatever symbol they are. Man I gotta try this....

[Shadowshear]

If you cast two catastrophes back to back, with no one passing the castle in between them, you will kill every monster on the field. I tried it once but forgot about the recovery and left 3 of Morroc's creatures alive, Darn Castle...

[dngrmice]

2 Catastrophes will kill off every creature except the powder eater. It takes the floor of the max hit points(1)divided by 2. Very useful when covering the map with them and killing everyone else.