green hydra cards mtg Savageborn [Dragon's Maze] double the number of +1/+1 counters on this creature. ≫ MTG Aspect of Hydra

And it even has an activated ability that doubles a creatures power until the end of turn

Snapcaster Mage allows you to get twice the value out of your spells and it allows you to get out of trouble when you normally couldnt, exactly by salvaging your used spells

While Calamity Bearer only works with giant sources, this is exactly the kind of effect Im looking to showcase

Honorable Mention #1 and #2 - Liesa, Shroud of Dusk AND Dargo, the Shipwrecker The problem with these two potential leaders is very powerful

(2017-08-25) Any continuous effects with a "for as long as" duration such as that of Mathas, Fiend Seeker ignore phased-out objects