Arena of Glory 351/319 (Modern Horizons 3) - Borderless

This land enters tapped unless you control a Mountain. {T}: Add {R}. {R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)

NM - $21.50
LP - $17.00
MP - $13.00
HP - $8.50
DMG - $4.50