This is also leagues worse than something like Heirloom Blade. While being a combat trick is cute, there are other equipment / vehicles I'd much rather run over Embercleave.
It's a super expensive combat trick that's always going to cast at least RR. If you're casting this for 2-3 mana in a red deck, you've probably already won.
My High Octane Unpowered Cube on CubeCobra
My High Octane Unpowered Cube on CubeCobra