Underdark Beholder [Mystery Booster Playtest Cards] Baddest and its activated abilities can't

and its activated abilities can't be activated unless they're mana abilities

• Create a 1/1 green Insect creature token

Set: Foreign Black Border Type: Creature — Illusion Rarity: Uncommon Cost: {3}{U} Flying

" (At the beginning of its controller's upkeep

Set: Core Set 2020 Prerelease Promos Type: Legendary Planeswalker — Ajani Rarity: Mythic Cost: {2}{W}{W} +1: You gain life equal to the number of creatures you control plus the number of planeswalkers you control

Underdark Beholder [Mystery Booster Playtest Cards] Baddest and its activated abilities can'tSet: Mystery Booster Playtest Cards Type: Creature Beholder Rarity: Rare Cost: {4}{B}{B} Underdark Beholder enters the battlefield with ten eyestalk counters on it. If Underdark Beholder would be dealt damage, remove that many eyestalk counters from it instead. If you can't, sacrifice it. Whenever Underdark Beholder attacks, reveal cards from the top of your library until you reveal an instant, sorcery, or enchantment card with converted mana cost