pokemon card tapu fini GX Pokémon Hit Points170 HP Form Tapu Lele- Tapu Koko -

It shows you where the market has been and where it might be heading

Rarity : Rare Cost : 3BB Colour Identity : Black Usage : Offers an alternative win condition based on accumulating treasure tokens

He'd been trying to take advantage of Master of Cruelties, a card that had captured the imaginations of more than a few readers, and realized that Master of Cruelties doesn't actually need power to reduce an opponent to 1 life (although it's certainly worse against creatures if it doesn't have any), so he could use Heartless Summoning to play Master of Cruelties, since he was planning to make it unblockable with Rogue's Passage anyway

Whenever is the signal word for triggered ability, for which the triggering event is: Flamerush Rider attacks this phrase means that the trigger is expecting Flamerush Rider to be declared an attacker at the declare attackers step