Sheoldred, Whispering One [Iconic Masters] 78 you can Tribute Summon this

you can Tribute Summon this card with 1 Tribute

sacrifice Contamination unless you sacrifice a creature

Neither player can Special Summon a Synchro Monster until your opponent's next End Phase

During each of your End Phases

Sheoldred, Whispering One [Iconic Masters] 78 you can Tribute Summon thisSet: Iconic Masters Type: Legendary Creature 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.