None of the regular printings of these cards are particularly worth much
That means the overall card has a red and white colour identity, so can only be used with Commanders that have red and white in their colour identity (Boros, Mardu, Naya, or Jeskai)
Notably though, tokens cant chump-block this as the card explicitly states zero is an even number and tokens have a converted mana cost of zero
But that mana is temporary, and whatever big spell they cast, you can just counter anyway
You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells
Gitaxian Probe You may think that [c]Gitaxian Probe[/c] costs one mana, but in the vast majority of circumstances, youll want to play it for zero mana and pay the two life instead