That uh... collar thing eliminates their land bonus, adds 30 to your attack, and it doesnt matter that you lose the attacking powder eater because your original stays.
Tombstone lets you swap a move command for a full hand on the next turn, provided you're next to a creature that can kill your powder eater.
Angry Mask is essentially a cheap Spiked Shield if you survive the enemy's attack, but the damage penetrates.
Protean Ring is great to use before you pump their hp up, and free, but you cant use it in defense because it will reset your powder eater to its original mhp.
I'm having a lot of fun with a deck that uses a lot of the combos above, some direct damage, and some sulfurous balloons. I'm using a couple fays and lichenoids to pump up the eaters, then a couple fat bodies and 4 mutations. Mass Growth and Reinforce also, and Chariot to get around the special tiles. MHP sword is great once their hp gets high enough also, and Mesozoic Song... because Multiplying into a fearsome dinosaur is just plain hilarious (and you can still use the attack items you were going to use with just the plain old powder eater).
Good luck - it's an awesome idea for a deck
