one piece trading card game op05 OP05-069 SR Super Parallel where iconic One Piece characters reach new levels of power and challenge epic destinies OP05-119] Monkey.D.Luffy SEC/P〈Parallel〉＜PRB01＞

So long as you have black mana to spend, Crypt Rats can wipe the board of anything as well as deal burn damage to your opponents

so more generally, are creatures considered attacking immediately when they are declared attackers, do their triggers need to resolve first (step change), or something else

This is especially true once you move beyond mono-color decks and start exploring other strategies and formats where multicolored mana bases get more ambitious

The base version of the card sits around $1.50, and even the borderless anime-style printing with art by Minoru & Kei Satsuki runs about $5

Since you're already incentivized to be loading up your hand, you can realistically expect the activated ability to give a functional +5/+5 or greater