For display, a clean raw near-mint copy gets you the card for a fraction of slab money
Its Let Loose Pok-Power forces both players to shuffle their hands in and draw 4 cards
Beyond that there is how immediate the life gain is, how much you get or can potentially get, how cheap the card or effect is and how hard it is to disrupt
Three mana is a lot less than four in my aggressive white decks, and the body is big enough to outsize the other aggressive decks and rumble with beefy Green creatures
However, Normal Energy Cards only work as Normal Energy you cant use a Normal Energy to power a move that requires one Fire Energy
Aside from being Gengar, who should be adored by all, this take on the Pokmon has 310 HP, and has a very potent ability