Bloated Contaminator [Phyrexia: All Will Be One] The Lost Caverns of Ixalan Commander return target creature card from

return target creature card from your graveyard to the battlefield tapped and attacking

We can't allow that

you may cast an artifact spell from your hand or graveyard by paying life equal to its mana value rather than paying its mana cost

If you rolled 6 exactly seven times

The once shining city in the clouds

Bloated Contaminator [Phyrexia: All Will Be One] The Lost Caverns of Ixalan Commander return target creature card fromSet: Phyrexia: All Will Be One Type: Creature Phyrexian Beast Rarity: Rare Cost: {2}{G} Trample Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Whenever Bloated Contaminator deals combat damage to a player, proliferate. (Choose any number of permanents and or players, then give each another counter of each kind already there.)