Gix, Yawgmoth Praetor

Flying

Whenever this creature deals combat damage to a player, that player exiles the top card of their library.

You may play lands and cast spells from among cards exiled with this creature.

Whenever a player casts a spell they don't own, that player creates a Treasure token.

Whenever a creature deals combat damage to one of your opponents, its controller looks at the top card of that opponent's library and exiles it face down. They may play that card for as long as it remains exiled. Mana of any type can be spent to cast a spell this way.

Deathtouch

Face-down creatures you control have ": Turn this creature face up. If you can't, exile it, then you may cast the exiled card without paying its mana cost."

Whenever an Assassin you control deals combat damage to an opponent, cloak the top card of that player's library.

Menace

Whenever this creature deals combat damage to a player, that player exiles a card from their hand face down.

You may look at cards exiled with this creature, and you may play lands and cast spells from among those cards.

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Nashi deals combat damage to a player, exile the top card of each player's library. Until end of turn, you may play one of those cards. If you cast a spell this way, pay life equal to its mana value rather than paying its mana cost.

Flying

Whenever this creature deals combat damage to a player, you may pay . If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.