If a substitute card enters a public zone (the battlefield, the graveyard, the stack, or exile unless it's exiled face down), use the actual double-faced card and set the substitute card aside
You can play around Force Spike fairly easily but trying to have three spare mana after doing something useful is a tall order
Perhaps more mechanically conventional, Amy Rose and Miles "Tails Prowler" offer strong choices for Equipment and Vehicle decks, respectively
Regardless of edition, this Suicune's art illustrates a calm moment of this Pokemon cloaked in dark blue shadows, depicting a similar scene to the Team Rocket Returns version
After that, my choices vary widely
Domain encourages you to play with all five colors in your deck, uniting all of Dominaria