Welcome to one of the most debatable topics in the entirety of MTG
This seems a bit risky at six mana, but theres all kinds of uses for that if you can make two copies the turn it comes down
While Burn comes to mind, it might be better off using Destructive Revelry to destroy Leyline of Sanctity (although Isolation Tower suddenly becomes much more appealing if you are playing budget Mono-Red Burn, since the mono-red builds of Burn don't really have an answer to Leyline of Sanctity)
Loxodon Warhammer (SLD foil $10) Adding three power is the magic number for both of them, and while a classic, you especially want trample on Tifa
Legendary Creature - Crab Leviathan Color tag templates(None) Colossus of Akros Defender, indestructible : Monstrosity 10
Celebration At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, target creature you control gets +1/+1 until end of turn