Splinter Twin + Nurturing Presence + Devoted Druid

Splinter Twin

Nurturing Presence

Devoted Druid

How it works

1. Activate Devoted Druid by tapping it, creating a token copy of itself with haste.
2. When the Devoted Druid token enters the battlefield, the nontoken Devoted Druid triggers, giving itself +1/+1 until end of turn.
3. Activate Devoted Druid by putting a -1/-1 counter on it, untapping it.
4. Repeat.
5. Optionally, you may use the mana abilities of the Devoted Druid tokens to add infinite .