Have (Arena)

Gearsmith Guardian

Gearsmith Guardian gets +2/+0 as long as you control a blue creature.

Scholar of Stars

When Scholar of Stars enters, if you control an artifact, draw a card.

Sai, Master Thopterist

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.
{1}{U}, Sacrifice two artifacts: Draw a card.

Aviation Pioneer

When Aviation Pioneer enters, create a 1/1 colorless Thopter artifact creature token with flying.

Diamond Mare

As Diamond Mare enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.

Meteor Golem

When this creature enters, destroy target nonland permanent an opponent controls.

Riddlemaster Sphinx

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Riddlemaster Sphinx enters, you may return target creature an opponent controls to its owner's hand.

Air Elemental

Zahid, Djinn of the Lamp

You may pay {3}{U} and tap an untapped artifact you control rather than pay this spell's mana cost.
Flying

Gearsmith Prodigy

Gearsmith Prodigy gets +1/+0 as long as you control an artifact.

Island

Tempest Djinn

Flying
This creature gets +1/+0 for each basic Island you control.

Befuddle

Target creature gets -4/-0 until end of turn.
Draw a card.

Divination

Aven Wind Mage

Flying
Whenever you cast an instant or sorcery spell, Aven Wind Mage gets +1/+1 until end of turn.

Disperse

Return target nonland permanent to its owner's hand.

Gilded Sentinel

Arcane Encyclopedia

Field Creeper

Waterknot

Enchant creature
When Waterknot enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.