As long as your deck runs heavy on draw and discard, you fill your graveyard up with expensive spells (or cheap ones simply by casting them), then once this big boy hits the battlefield, you can start reigning terror on your opponents by casting those big spells from beyond the grave for free
While morph helped a little (you could still play the creature even if you had color problems) it didn't fill the role we needed
When this creature enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control
We could make a green-white-blue-black (GWUB) exalted deck
Enchantment Enchantment (CTRL to add secondary) Instant Restoration Magic Tiered (Choose one additional cost.) Cure Target permanent gains hexproof and indestructible until end of turn
1 Charizard GX If youre a veteran of the Pokemon scene, it shouldnt come as any kind of surprise to find out who the most valuable rainbow rare is