Karn, the Great Creator (Retro) [Secret Lair Drop Series]Set: Secret Lair Drop Series Type: Legendary Planeswalker Karn Rarity: Rare Cost: {4} Activated abilities of artifacts your opponents control can't be activated. +1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value. 2: You may reveal an artifact card you own from outside the game or choose a face up artifact card you own in exile. Put that card into your hand.

pay {0} and exile it with three time counters on it

Set: Zendikar Rising Promos Type: Sorcery Rarity: Rare Cost: {1}{U} Kicker {3}{U}

Set: Gym Heroes 1st Edition Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

Set: EX: Emerald Type: Fighting Rarity: Holo Rare Retreat cost: Colorless

Set: EX: Crystal Guardians Type: Water Rarity: Rare Retreat cost: Colorless

MagicTheGathering

you may change "swampwalk" to "plainswalk

sacrifice Phantasmal Forces unless you pay {U}

and a number of game-changing attacks

Set: Commander 2016 Type: Enchantment — Aura Rarity: Rare Cost: {2}{R}{R} Enchant creature you control

Charmander

Set: Double Masters Type: Sorcery Rarity: Rare Cost: {B} Target player reveals their hand