Skittering Precursor + Sword of the Meek + Ruination Guide + Megatog

Skittering Precursor

Sword of the Meek

Ruination Guide

Megatog

How it works

1. Activate Megatog by sacrificing Sword of the Meek.
2. Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
3. When the Eldrazi Spawn enters the battlefield as a 1/1 due to Ruination Guide, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn.
4. Resolve the Megatog ability, giving it +3/+3 until end of turn.
5. Repeat.

This clever loop relies on Megatog's ability to repeatedly consume Sword of the Meek as an artifact sacrifice, which triggers Skittering Precursor to spawn an Eldrazi. Ordinarily a 0/1, that token is instantly pumped into a 1/1 by the passive lord effect of Ruination Guide, precisely meeting the condition to resurrect Sword of the Meek straight from your graveyard and attach it to the newborn creature. Because the freshly generated Eldrazi Spawn also features a built-in sacrifice ability for colorlessness, you can siphon off infinite colorless mana while cycling the sword back and forth to endlessly swell Megatog's power.