Ornithopter

Ashnod's Transmogrant

{T}, Sacrifice Ashnod's Transmogrant: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.

Bog Imp

Flying (This creature can't be blocked except by creatures with flying or reach.)

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Mightstone

Sage of Lat-Nam

Flying Men

Azure Drake

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

Mishra's Factory

{T}: Add {C}.
{1}: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Swamp

Howl from Beyond

Target creature gets +X/+0 until end of turn.

Island

Dark Ritual

Zephyr Falcon

Drafna's Restoration

Put any number of target artifact cards from target player's graveyard on top of their library in any order.