This restriction, of course, prevents Giratina from easily using this attack over and over (thanks, Arceus, because there is no Pokmon in the format that can withstand these numbers)
So unless you're running Moonmist in a Tera deck - which I've been reminded is five color, so it's at least possible if not good - you'll need some other five color MTG commander, which isn't a transformer, to lead your deck
Besides the flexibility, you can give relevant abilities to your creatures, both offensively (flying) or defensively (lifelink and vigilance)
None of the effects themselves are really what lands this card in this article, but rather some other details about them in relation to the game
Especially with V-HERO Trinity, who can tackle your opponent's frontrow while dealing incredible amounts of damage if there isn't a "no attack" clause (really, 5k on three attacks against monsters adds up fast)
There are other ways to find the value of your raw Pokmon cards, but TCGplayer and PokeDATA are probably my favorite because they are easy to use and generally reliable