You may activate equip abilities any time you could cast an instant.
Choose one — • Exile all artifacts. • Exile all creatures. • Exile all enchantments. • Exile all planeswalkers.
{T}: Add to your mana pool one mana of any color in your commander's color identity. Sacrifice Commander's Sphere: Draw a card.
Arcane Sanctum enters the battlefield tapped. {T}: Add {W}, {U}, or {B} to your mana pool.
Sandsteppe Citadel enters the battlefield tapped. {T}: Add {W}, {B}, or {G} to your mana pool.
Creatures you control get +1/+1. Whenever you tap a land for mana, add one mana to your mana pool of any type that land produced.
Equipped creature has deathtouch. Whenever equipped creature deals combat damage to a player, that player loses half his or her life, rounded up. Equip {3}
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast.
Until end of turn, target creature gets +3/+3 and gains trample and "Whenever this creature deals combat damage to a player, draw that many cards."
Choose a nonland permanent you don't control, then each other player chooses a nonland permanent he or she doesn't control that hasn't been chosen this way. Destroy all other nonland permanents.
Worn Powerstone enters the battlefield tapped. {T}: Add {C}{C} to your mana pool.
Target player draws four cards.