Arena of Glory

This land enters tapped unless you control a Mountain.
{T}: Add {R}.
{R}, {T}, Exert this land: Add {R}{R}. If any of 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.)

La Arena de la gloria entra al campo de batalla girada a menos que controles una Montaña.
{T}: Agrega {R}.
{R}, {T}, espolear la Arena de la gloria: Agrega {R}{R}. Si ese maná se usa en un hechizo de criatura, esa criatura gana la habilidad de prisa hasta el final del turno.