Omen Machine [New Phyrexia] Serpent It has "Sacrifice this creature:

It has "Sacrifice this creature: Add {C}

Exile it at the beginning of the next end step or if it would leave the battlefield

Nissa has shown me that

you may discard all the cards in your hand

Set: Dominaria Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {0} {T}: Add one mana of any color among legendary creatures and planeswalkers you control

Omen Machine [New Phyrexia] Serpent It has "Sacrifice this creature:Set: New Phyrexia Type: Artifact Rarity: Rare Cost: {6} Players can't draw cards. At the beginning of each player's draw step, that player exiles the top card of their library. If it's a land card, the player puts it onto the battlefield. Otherwise, the player casts it without paying its mana cost if able.