Guardian of the Math Problems

Mr. Purrrty, Vengeful Keeper of Melons
Cost: 2 colorless mana, 1 white mana, 1 green mana

Vigilance, Lifelink, Ward 1

When Mr. Purrrty enters, create a 0/1 melon token with "you may tap this card for one green mana. When you do, create a 0/1 melon token with this same effect"

Whenever one or more melons you control leave the field, put a +1/+1 counter on Mr. Purrrty. Whenever one or more melons enter the field under your control, you may move one +1/+1 counter from Mr. Purrrty to any other creature you control. Each of these effects can only be activated once each turn.

Melons you control have Ward 1.

Power: 1 / Toughness: 2