Bristly Bill, Spine Sower + Cryptic Trilobite + Stonework Packbeast

Bristly Bill, Spine Sower

Cryptic Trilobite

Stonework Packbeast

How it works

1. Activate Bristly Bill by paying 3, doubling the number of +1/+1 counters on creatures you control.
2. Activate Cryptic Trilobite four times by removing four +1/+1 counters from it, adding eight C that can only be spent to activate abilities.
3. Activate Stonework Packbeast twice by paying 4, adding .
4. Repeat.

This brilliant loop turns Bristly Bill, Spine Sower into an engine for exponential growth, using its activation to double the counters on your board for {3}{G}{G}. Cryptic Trilobite serves as the battery for this engine, cashing in those counters for restricted colorless mana that feeds directly back into ability costs. Meanwhile, Stonework Packbeast steps in to convert that colorless energy into the colored mana needed to pay for Bristly Bill's demanding activation cost.