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Tons of everything

Generating Massive Card Advantage With Ancestral Recall, blue decks could easily chain multiple copies per turn in the early game

Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.) At the beginning of your end step, draw a card if you've gained 3 or more life this turn

Having a 4/4 or 5/5 with first strike, vigilance, and lifelink might be enough against some decks, but against others you really just need to kill them

This halves the damage the opponent will take for the rest of the turn, but after losing a monster and having to deal with a 4000 ATK and a monster with 2000+, thats not going to matter much