Coin of Mastery

Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it.

Remove a +1/+1 counter from this creature: Add one mana of any color.

: Put a +1/+1 counter on this creature.

Each Dragon you control enters with an additional +1/+1 counter on it.

: Add one mana of any color.

This artifact enters tapped.

: Add X mana of any one color, where X is the greatest number of creatures you control that have a creature type in common.

When this artifact enters, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")

: Add one mana of any color.

As this artifact enters, choose a color.

Creatures of the chosen color get +1/+1.

Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color.

As this artifact enters, choose a color.

Creatures you control of the chosen color get +1/+0.

: Add one mana of the chosen color.