Magical Hack [Alpha Edition]Set: Alpha Edition Type: Instant Rarity: Rare Cost: {U} Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwalk" to "plainswalk." This effect lasts indefinitely.)

and Y is half the number of Forests you control

Set: From the Vault: Relics Type: Artifact Rarity: Mythic Cost: {5} {T}

and cannot be truly contained

Set: Commander 2017 Type: Creature — Dragon Rarity: Mythic Cost: {6}{R}{R} Flying

Set: Commander 2016 Type: Sorcery Rarity: Rare Cost: {4}{W} Each creature deals damage to itself equal to its power

Set: Classic Sixth Edition Type: Instant Rarity: Uncommon Cost: {U} Search your library for an instant or sorcery card

if an opponent lost 3 or more life this turn

Set: Judge Gift Cards 2007 Type: Sorcery Rarity: Rare Cost: {1}{W}{B} Destroy target permanent

with Radiant Greninja leading the charge in the Pokémon TCG: Sword & Shield—Astral Radiance expansion

At the beginning of the upkeep of enchanted enchantment's controller

Set: Neo Revelation 1st Edition Type: Lightning Rarity: Rare Retreat cost: Colorless

Set: McDonald's Promos: 2016 Collection Type: Darkness Rarity: Promo Retreat cost: Colorless