Rimstalker Manticore

Reach, Flanking, Mountainwalk
{1}{u/r}: Gains Flying until end of turn, use this
ability only if you've cast an instant or sorcery
this turn.
On your end step you may tap two untapped Mountains if you do, untap Rimstalker Manticore.
Clumsy flyers at best, manticores make up for it with
their tail spikes, climbing, and leaping.