The same is true for the colors of the spell, the colors of a split card are both colors everywhere EXCEPT on the stack when being cast, where only the cast part(s) colors are used
Unfortunately, in competitive formats, Heroic Intervention isnt played nearly this much, however, thats no reason to dismiss its power
The upkeep triggers stack on your turn, at the beginning of your turn, and then you move forward
A creature destroyed this way can't be regenerated
Though it's possible for your opponents to outdraw you through this effect, the fact you can get two draws every turn keeps things in your favor
Knuckles the Echidna One of the best haste creatures in the game, Knuckles the Echidna is pretty lousy as a red commander but very strong in the 99