They do see play, though, especially in Cube where these two art treatments can bling out your Cube experience
This is great news for fans of both series, but could also be a worthwhile starting point for MTG newcomers looking for a reason to start playing
If a face-up FIRE monster(s) you control is destroyed by card effect, while this card is in your GY (except during the Damage Step): You can Special Summon this card (but banish it when it leaves the field), then draw 1 card
As the damage is dealt, however, the creature with regeneration is tapped, taken out of combat, and has all damage removed from it, thus bringing it back to full health
Keep an eye out for abilities that interact well with your commander