Trial // Error [Dissension] Urza's where X is the number

where X is the number of artifacts your opponents control

Set: Core Set 2021 Type: Sorcery Rarity: Rare Cost: {10}{R}{R} This spell costs {X} less to cast

Set: Odyssey Type: Creature — Elephant Wurm Rarity: Uncommon Cost: {3}{G}{G} Threshold — Metamorphic Wurm gets +4/+4 as long as seven or more cards are in your graveyard

Set: Commander Masters Type: Creature — Cyclops Wizard Rarity: Common Cost: {4}{R} When Cyclops Electromancer enters the battlefield

Set: March of the Machine Prerelease Promos Type: Creature — Phyrexian Rarity: Rare Cost: {3}{W}{W} Flying

Trial // Error [Dissension] Urza's where X is the numberSet: Dissension Type: Instant Instant Rarity: Uncommon Cost: {W}{U} {U}{B} Return all creatures blocking or blocked by target creature to their owner's hand. Reverse Type: Instant Counter target multicolored spell.