+Groundbreaker (3)
Equipped creature gets +2/+1 and has trample.
Equip Citizen
Equip (: Attach to target creature you control. Equip only as a sorcery.)
Trample, haste
At the beginning of the end step, sacrifice Groundbreaker.
, Sacrifice Mishra's Groundbreaker: Target land becomes a 3/3 artifact creature that's still a land. <I>(This effect lasts indefinitely.)</I>
Gatherer works better in the Companion app!