zendikar collector booster box AmiAmi [Character & Hobby Shop] Between wildcard slots Zendikar Rising: Gift Edition Bundle

Probably in one of the older core sets)

The rapidly accumulating card advantage alongside dealing extra damage each time a ninja you control connects in combat can quickly snowball games, especially when a 1-drop gets through unchecked on turn 2

The removal trigger comes upon attacking, so if things go your way then you blow up their best blocker and suddenly Armix puts your opponents into a pickle

Be wary of your surroundings though, the environment around the Arena has the potential to strengthen your Beasties, or even weaken your Spells

(Other) Added Leviathan Liopeuras and Thalassas

If you notice any missing cards, mistakes, or low quality images let me know and I'll update them eventually