Merchant Ship [Arabian Nights] Battle for Zendikar they burrowed

they burrowed

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

Set: Legends Type: Creature — Horror Rare Cost: {3}{B}{B}{B} First strike At the beginning of your upkeep

transform Thaumatic Compass

except it has "At the beginning of your upkeep

Merchant Ship [Arabian Nights] Battle for Zendikar they burrowedSet: Arabian Nights Type: Creature Human Uncommon Cost: {U} Merchant Ship can't attack unless defending player controls an Island. Whenever Merchant Ship attacks and isn't blocked, you gain 2 life. When you control no Islands, sacrifice Merchant Ship.