Stab and Steal

Nonbasic lands are Mountains.

Flying At the beginning of your upkeep, sacrifice this creature unless you return a land you control to its owner's hand.

Flying Landfall — Whenever a land you control enters, you may gain control of target creature for as long as you control this creature.

This land enters tapped. When this land enters, target creature gets +2/+0 until end of turn. : Add .

This land enters tapped. Whenever a Mountain you control enters, if you control at least five other Mountains, you may have this land deal 3 damage to any target. : Add .