Obscure

Obscure's power and toughness is X/X
If X is 2 or more: this creature is unblockable If X is 3 or more: sacrifice a creature, Obscure gains the sacrificed creature's power and toughness if X is 4 or more: this creature gains hexproof If X is 5 or more: once per 2 turns, you can do X damage to target creature
"The corner of your vision, the space behind a passing carage, that is me."