Stomvale Paladin

When Stormvale Paladin enters the battlefield it gets +X/+0 until end of turn. Where
X is half the Mountains you control
Dash {2}{r}{r} (you may cast this card for its dash cost. If you d is gains haste and is returned to your hand from the battlefield at the beginning of your next end step)
The Paladins of Stormvale protect and expand their territories at all costs, including sanity