Arena of Glory 351 (Modern Horizons 3)

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 - $25.60
LP - $20.50
MP - $15.30
HP - $10.30
DMG - $5.10