Svogthos, the Restless Tomb [Ravnica: City of Guilds] SM109 Creatures your opponents control with

Creatures your opponents control with counters on them can't attack or block

You can only Special Summon "Shiranui Shogunsaga(s)" once per turn

Set: Gatecrash Type: Creature — Elf Wizard Rarity: Mythic Cost: {2}{G}{U} Each other creature you control enters the battlefield with a number of additional +1/+1 counters on it equal to Master Biomancer's power and as a Mutant in addition to its other types

and the card that left the field was "Stardust Dragon" or a Synchro Monster that listed "Stardust Dragon" in its text: You can apply 1 of the following effects

Svogthos, the Restless Tomb [Ravnica: City of Guilds] SM109 Creatures your opponents control withSet: Ravnica: City of Guilds Type: Land Rarity: Uncommon {T}: Add {C}. {3}{B}{G}: Until end of turn, Svogthos, the Restless Tomb becomes a black and green Plant Zombie creature with "This creature's power and toughness are each equal to the number of creature cards in your graveyard." It's still a land.