Decidueye GX (SM37) [Sun & Moon: Black Star Promos] U-ARC159 if you control a face-up

if you control a face-up "Gladiator Beast" monster: Negate the activation and destroy it

This card gains 100 ATK for each "Gem-" monster in your Graveyard

and all cards they draw until the end of their 3rd turn after this effect's activation

Set: Generation Force Card type: Normal Spell Rarity: Ultra Rare When you control no face-up monsters: Pay half of your Life Points

if your other DARK Spellcaster-Type monster battles an opponent's monster: You can send this card from your hand or face-up from your field to the Graveyard

Decidueye GX (SM37) [Sun & Moon: Black Star Promos] U-ARC159 if you control a face-upSet: Sun & Moon: Black Star Promos Type: Grass Rarity: Black Star Promo Retreat cost: Colorless,Colorless