Thoughtseize (Borderless Etched Foil) [Secret Lair Drop Series] BW39 and has "Whenever a player

and has "Whenever a player casts a spell or a creature attacks

Set: Assassin's Creed Type: Legendary Creature — Human Assassin Pirate Rarity: Mythic Cost: {2}{U}{B}{R} At the beginning of your end step

Set: Sun & Moon: Cosmic Eclipse Type: Dragon Rarity: Ultra Rare Retreat cost: Colorless

Set: EX: Crystal Guardians Type: Lightning Rarity: Common Retreat cost: Colorless

{T}: You may put a creature card from your hand onto the battlefield

Thoughtseize (Borderless Etched Foil) [Secret Lair Drop Series] BW39 and has "Whenever a playerSet: Secret Lair Drop Series Type: Sorcery Rarity: Rare Cost: {B} Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.