Start with the Altar, to sacrifice Ozox for 2 mana and get a treasure
A 4/4 merfolk wizard that requires its controller to champion a merfolk, whenever this creature deals damage to a player, its controller can sacrifice a merfolk to take an extra turn after this one
Bruenor Battlehammer is my pick because it balances the power of some cost reduction without being too much of a kill-on-sight commander
We have, of course, seen cards with abilities like these played consistently in competitive play, so its quite possible Pluto will see play as well
Useful late game to save your own creatures, particularly those with come into play effects
A colossal hand of clouds reaches from the storm above, sending a vibrant line of luminous red and yellow electricity down to the vivid blue landscape below