Utility token: +1/+1 counter through kicker

Temporary name: Overgrapht
Mechanic type: Utility Token
Utility Token: "Overgraph Token"
Utility Token text: "As an additional cost to cast a creature spell, you may pay {2} and sacrifice an untapped [[Overgraph token]]. If you do, that creature enters the battlefield with a +1/+1 counter on it."

Knobs:
- Allowing or not multiple tokens to be sacrificed per creature spells;
- Cost to sacrifice the token;
- Requiring the token to be untapped or not to sacrifice it;
- Tying it or not to a kicker like mechanic (may require change in templating);
- Executing it like a token or like an emblem with counters;
- Executing it like an enchantment, and artifact or a creature with a variantion of Graft;
- Allowing only creatures or also allowing cards of types that turn into creatures (normally vehicles, but variations of tribal or a new subtype might also work);
- Activating uppon cast or uppon the creature entering the battlefield.

Innovation:
- +1/+1 counter Utility token;
- Reduced complexity (can only be activated uppon the creature being cast or entering the battlefield)