Silvanus's Invoker 
Creature — Dragon Druid
Conjure Elemental — 
: Untap target land you control. It becomes an 8/8 Elemental creature with trample and haste until end of turn. It's still a land.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL