Simic Ragworm

Spend one blue mana, untap, block again: that is the entire promise here, and it reads as a clean, low-ambition expression of green-blue's defensive pitch from an era when the guild was being built around walls, value, and creatures that did more than swing. The trouble is the math. A 3/3 that untaps for a single blue is a fine answer to ground creatures its size or smaller, but it taxes your mana every combat to do the one thing it does, and it never threatens anything on offense. Compare it to a creature with vigilance, which attacks and blocks for free without a recurring fee; the Ragworm pays per untap for a strict subset of that flexibility. The repeatable-untap chassis has shown up elsewhere with sharper purposes (untapping tied to evasion, or feeding a meaningful tap ability that actually generates value), but here the untap pours into nothing but another block, leaving the card parked at the floor of its design space rather than the ceiling. It is an honest common: a body that lets a slower green-blue deck hold a board together while its real plan assembles, with little reason to exist outside that narrow brief.