Devoted Druid + Leyline of Abundance + Innkeeper's Talent + High Score

Devoted Druid

Leyline of Abundance

Innkeeper's Talent

High Score

How it works

1. Activate Leyline of Abundance by paying 6, putting four +1/+1 counters on each creature you control due to Innkeeper's Talent and High Score.
2. Activate Devoted Druid's first ability by tapping it, adding .
3. Leyline of Abundance triggers, adding .
4. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping Devoted Druid.
5. Repeat from step 2 three additional times.
6. Repeat from step 1.

This loop relies on Devoted Druid generating green mana while rapidly untapping itself at the cost of -1/-1 counters, a process heavily amplified by Leyline of Abundance doubling your mana production whenever a creature taps for mana. To fuel this engine, you first invest in Innkeeper's Talent and High Score, whose replacement effects stack to multiply the +1/+1 counters you place when you activate Leyline of Abundance's massive mana sink ability. This influx of counters conveniently cancels out the Druid's self-inflicted -1/-1 counters while exponentially growing your board, letting you repeat the mana-generation cycle indefinitely.