cards that untap creatures mtg Slumbering Cerberus - Creature - tap all untapped creatures that share a creature type with it or untap all tapped creatures that share a creature type with it. Rules Text: Untap all, 98

This is a great flicker spell from Theros: Beyond Death that gives you a little more flexibility in whatever you need to flicker at a moment's notice

After that, it seems like this foil should be a solid steady gainer moving forward

To ensure you get those counters, look for folks like Renata, Called to the Hunt, Grumgully, the Generous, and Master Biomancer

Here you see that people have fallen to the temptation of the power offered by your Mythos creature, or Emrakul playing into that role on the plane of Innistrad

The only real catch is practicality, since it can be a little inconvenient if your opponents arent familiar with the card and need to check Oracle text