Broly, Saiyan of Legend

Flying, trample
Whenever you sacrifice another creature, exile cards equal to its mana value from the top of target player's library. Until your next end
step, you may play those cards, and mana of
any type can be spent to cast those spells.
Sacrifice another creature: Broly gains indestructible until end of turn. Tap it.
Activate only once each turn.