Xolatoyac, the Smiling Flood

The second ability is the one doing the quiet work, and it points the whole design at a target most Simic ramp ignores: not lands, but counters. Every permanent you control carrying a counter untaps on your end step, which turns the flood counters this creature distributes each combat into a self-sustaining loop (attack, flood a land, untap it before opponents' turns), but the reach extends to any +1/+1 or charge counter sitting on your board. Turning opponents' lands into Islands is the surface flavor; the strategic axis is a board seeded with counters that then stays available all the way around the table. Because the untap fires at your end step rather than your upkeep, the value lands on defense and interaction: creatures stay back as blockers through the rest of the round, and any tap-activated ability sitting on a countered permanent is live again for opponents' turns rather than idle until your next untap step. A 6/6 for six in these colors is a fair enough body to justify the slot, but the payoff is deferred: this is a commander that asks you to load the board with counters first and cash the end-step reset second. It is a Salamander Serpent built as an untap-engine centerpiece, and the flood counters are less a win condition than a way to keep a countered board perpetually ready.