Omen Hawker

{T}: Add {C}{U}. Spend this mana only to activate abilities.

Aether Spellbomb

{U}, Sacrifice Aether Spellbomb: Return target creature to its owner's hand.
{1}, Sacrifice Aether Spellbomb: Draw a card.

{2}, {T}, Sacrifice a land: Draw a card and put a charge counter on Arcane Spyglass.
Remove three charge counters from Arcane Spyglass: Draw a card.

({S} can be paid with one mana from a snow source.)
When Arcum's Astrolabe enters the battlefield, draw a card.
{1}, {T}: Add one mana of any color.

{T}: Add {C}. Spend this mana only to activate an ability or cast an artifact spell.

Devoid (This card has no color.)
{C}, {T}: Tap target creature. ({C} represents colorless mana.)

Equipped creature has flying and first strike.
Equip {2}

Commander creatures you own have "When this creature enters or leaves the battlefield, draw a card."

{1}{U}, {T}, Sacrifice Courier's Capsule: Draw two cards.