special mtg cards 25 Random Rare Foils/Mythics/Planeswalkers : Toys & Games Add to your mana pool an amount of black mana equal to the sacrificed creatures converted mana cost. MTG Singles (All) – Tagged

So why not just play something like Mother Bear instead

This is because the legality of targets is checked only as the spell begins to resolve, before any actions are performed

Polukranos Reborn / Polukranos, Engine of Ruin Polukranos Reborn is pretty cheap to cast for such a big creature with reach, so its a very useful blocker

For now, though, it's wait-and-see approach on what will inevitably become the most expensive MTG card ever sold, with just how much that sale will amount to a hot topic of debate

This is where Scryfall can be a great help

Draconic Domination: Dragon Tribal Main Commander: The Ur-Dragon Sub-Commanders: O-Kagachi, Vengeful Kami and Ramos, Dragon Engine or Scion of the Ur-Dragon