Annabeth, Daughter of Athena

Annabeth, Daughter of Athena can't be blocked by creatures with power 3 or greater.

Whenever Annabeth, Daughter of Athena deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn,
you may cast that card and you may spend
mana as though it were mana of any color to cast that spell.