Sludge Monster [Innistrad: Double Feature] 189a there is but one creed:

there is but one creed: Chaos shall reign

Havoc is a small price to pay for data

Set: March of the Machine Prerelease Promos Type: Legendary Creature — Human Wizard Rarity: Rare Cost: {1}{U} Whenever you cast a legendary spell

return target creature to its owner's hand

Set: Celebrations: 25th Anniversary Type: Trainer Rarity: Holo Rare

Sludge Monster [Innistrad: Double Feature] 189a there is but one creed:Set: Innistrad: Double Feature Type: Creature Horror Rarity: Rare Cost: {3}{U}{U} Whenever Sludge Monster enters the battlefield or attacks, put a slime counter on up to one other target creature. Non Horror creatures with slime counters on them lose all abilities and have base power and toughness 2 2. Tracking it isn't the hard part.