Urban Retreat

The bounce clause is the whole idea here, and it runs in the direction opposite to what a tri-land normally offers. Instead of sitting in play, this one waits in hand: for two mana and a tapped creature returned to owner's hand, you put the land onto the battlefield at sorcery speed. That is a one-time transaction, not a loop. Once the land is down, the ability is spent; you cannot re-activate it from the battlefield, and it never bounces itself. What it does buy is a way to launder a creature that already spent its turn (a mana dork that tapped for mana, an attacker that connected and stayed tapped) back into hand, banking its enters-the-battlefield trigger for a later replay while a land you were holding hits the table. The sorcery-speed clamp is the load-bearing restriction: because you can only activate it during your own main phase with an empty stack, it never becomes a combat trick to blink a blocker out from under a swing or dodge removal. The Bant fixing is deliberately plain (it enters tapped, and taps for green, white, or blue), because the color access is not the sell. The real function is the single tempo-neutral exchange it offers a deck already built on reusable enters-the-battlefield bodies: turn a card you were sitting on into a fresh trigger and a land drop, once.