He Who knows

Divinity ({u/b}{u/b})
Look at your top card and bottom card of your library do the same to a target opponent.
or
Draw a card then choose a opponent and they must reveal their hand to you. Summon one 0/1 cultist with a doom counter on it.
(Demon magic) this ability can only be used if you have 5 doom counters, sacrifice all 5 of them, then summon a 4/4 Demon token with flying haste and lifelink, it dies after two tur