Certain Death vs Emrakul, the Promised End — MTG Card Comparison

Certain Death

Destroy target creature. Its controller loses 2 life and you gain 2 life.

*Some spirits cling to one person, feasting on the growing fear until a final moment of all-consuming terror.*

Emrakul, the Promised End

This spell costs {1} less to cast for each card type among cards in your graveyard.
When you cast this spell, you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn.
Flying, trample, protection from instants

*An enigma as vexing as life itself.*

Power/Toughness: 13/13