penny pokemon card full art - 239/198 - SV01: Scarlet & Violet Base Set [SECRET RARE] Listed cards may have imperfections. Pokémon TCG Penny (IR) Scarlet

So for four mana and four turns, your net result is either a 2/2 or 3/3 creature with no abilities other than to phase out again

Enough crewing creatures in those decks have strong EtBs

An infamous selection of cards back from Alpha back when Magics creator, Richard Garfield, didnt exactly know how to balance cards

It's good

Mangaras legendary status also makes him a viable candidate as a Commander, regardless of whether you would want to build around it for added effect or simply just have a defensive Commander letting you draw cards on the regular

The latter sort of card (those with Whenever you gain life triggers) work best with cards that can repeatedly gain life for minimal resource investment