Caltrops [Urza's Destiny] Penny Set: Eternal Masters Type: Enchantment

Set: Eternal Masters Type: Enchantment Rarity: Mythic Cost: {3}{R} {R}: You may put a creature card from your hand onto the battlefield

If you don't or can't make an exchange

As Phantasmal Terrain enters the battlefield

Set: Revised Edition Type: Creature — Merfolk Rarity: Rare Cost: {U}{U} Other Merfolk get +1/+1 and have islandwalk

the inhabitants of the Ivory Tower reward those who sacrifice power for knowledge

Caltrops [Urza's Destiny] Penny Set: Eternal Masters Type: EnchantmentSet: Urza's Destiny Type: Artifact Rarity: Uncommon Cost: {3} Whenever a creature attacks, Caltrops deals 1 damage to it. Toward the end, Gatha struggled to keep his experiments in and his patrons out.