And then there's Ognis, which I had less-than-nice things to say about last year
Although it works as a two-player game, I recommend as many players as you can get because the fun is in watching players get eliminated one by one
While the most powerful version is an Ace Spec, it does not see much play because its applications in a match are more limited than its counterparts
For 3 Energy (2x Grass, 1x Colorless), it does 80 DMG, and that goes to 150 DMG if you get heads from a coin flip (Will Supporter card, anyone?)
In a format where the vast majority of threats are 2-mana-or-less creatures in very low curve decks, ramping the opponent feels like such a bad beat
the real deal here is the hexproof granted by Shalai to everyone else