Most counterspells are blue cards, and specifically blue instants, as its what blue does best, but there are more than a few playable off-color counterspells
For the cost of each color mana, you can give your creatures a ton of useful keywords haste, trample, and lifelink and an additional combat phase
Tutors are great in Commander since its a 99-card, singleton format, which means Forerunner of the Empire and Priest of the Awakening Sun are super powerful
Discard a card: Put a +1/+1 counter on Psychic Frog
Wound Reflection Suggested Cut: Sadistic Shell Game In general, Im not a big fan of ceding control of my spell effects over to my opponents the way Sadistic Shell Game does
Ingenious Infiltrator A ninja from Modern Horizons , Ingenious Infiltrator allows you to draw a card every time a ninja you control deals combat damage to a player