Ebonlake Grotto Create two 1/1 blue Faerie Dragon creature tokens with flying
It may only enter with four +1/+1 counters on it, but it doubles the counters on all of your creatures whenever it attacks
Green is your most obvious and flexible third color, though, with the cross-synergy of GW Food effects hard to ignore (and some decent food generation in black to boot)
They also won't gain or lose any land types
This Booster Pack contains cards like Dragonite VSTAR or Mewtwo VSTAR (Regular and Secret Version), Rainbow Cards, and of course, the Radiant Venusaur, Blastoise, and Charizard cards , as well as the infamous PokeStop Stadium and Snorlax cards that are often used for the Stallax strategy
Also, once the ability is on the stack, even if the creature with the mechanic is removed from the battlefield or combat one way or another, the smaller creature will still get the +1/+1 counter as long as its power is still less than the Mentor creatures was as it last existed in combat