Anu, god of the heavens

Flying, first strike, vigilance
Anu isn’t a creature unless you control three or more legendary permanents.
Whenever you cast a legendary spell, draw a card for each of that spells colors, then discard a card.
Whenever a legendary source you control deals damage to a player, Anu deals 2 damage to any non player target.
{3}: target creature you control gets +2+2, first strike, and vigilance until end of turn. It becomes legendary in addition to its other types.