Temporal Aperture [Urza's Saga] Kor Artificer Set: Commander's Arsenal Oversized Type:

Set: Commander's Arsenal Oversized Type: Legendary Creature — Human Wizard Rarity: Rare Cost: {1}{W}{U}{B} Flying

Whenever an artifact an opponent controls is put into a graveyard from the battlefield

When Cao Ren

Ojutai Dragonspeaker

then proliferate again

Temporal Aperture [Urza's Saga] Kor Artificer Set: Commander's Arsenal Oversized Type:Set: Urza's Saga Type: Artifact Rarity: Rare Cost: {2} {5}, {T}: Shuffle your library, then reveal the top card. Until end of turn, for as long as that card remains on top of your library, play with the top card of your library revealed and you may play that card without paying its mana cost. (If it has X in its mana cost, X is 0.)