Skirk Prospector [Mystery Booster] Battlebond Prerelease Promos You may choose not to

You may choose not to untap Thran Weaponry during your untap step

Whenever a black creature enters the battlefield under your control

When Serra Avatar is put into a graveyard from anywhere

Set: Kaladesh Prerelease Promos Type: Legendary Planeswalker — Saheeli Rarity: Mythic Cost: {1}{U}{R} +1: Scry 1

It shows not what you are but what you were

Skirk Prospector [Mystery Booster] Battlebond Prerelease Promos You may choose not toSet: Mystery Booster Type: Creature Goblin Rarity: Common Cost: {R} Sacrifice a Goblin: Add {R}. Deep beneath the ruined continent of Otaria, there's a mine where goblins still work, ignorant of the destruction above.