Sheoldred, Whispering One (Phyrexian) [Secret Lair Drop Series] SM144 it produces colorless mana instead

it produces colorless mana instead of white mana

it gains rebound

whichever comes first

"'Ownership' is such a gray area

Set: Happy Holidays Type: Creature — Ooze Rarity: Rare Cost: {2}{R}{G} At the beginning of your upkeep

Sheoldred, Whispering One (Phyrexian) [Secret Lair Drop Series] SM144 it produces colorless mana insteadSet: Secret Lair Drop Series Type: Legendary Creature Phyrexian Praetor Rarity: Mythic Cost: {5}{B}{B} Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) At the beginning of your upkeep, return target creature card from your graveyard to the battlefield. At the beginning of each opponent's upkeep, that player sacrifices a creature.