
Steel Seraph | Artifact Creature | Angel | Prototype {1}{W}{W} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
Flying
At the beginning of combat on your turn, target creature you control gains your choice of flying, vigilance, or lifelink until end of turn. | Denys Tsiperko
5.0 LSV

Goring Warplow | Artifact Creature | Construct | Prototype {1}{B} — 1/1 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
Deathtouch | Wayne Reynolds
2.5 LSV

Cradle Clearcutter | Artifact Creature | Golem | Prototype {2}{G} - 1/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
{T}: Add an amount of {G} equal to Cradle Clearcutter's power. | Daarken
3.0 LSV

Bladecoil Serpent | Artifact Creature | Serpent | When Bladecoil Serpent enters the battlefield, for each {U}{U} spent to cast it, draw a card.
When Bladecoil Serpent enters the battlefield, for each {B}{B} spent to cast it, each opponent discards a card.
When Bladecoil Serpent enters the battlefield, for each {R}{R} spent to cast it, it gets +1/+0 and gains trample and haste until end of turn. | Joshua Cairos
4.5 LSV

Argivian Avenger | Artifact Creature | Shapeshifter | {1}: Until end of turn, Argivian Avenger gets -1/-1 and gains your choice of flying, vigilance, deathtouch, or haste. | Milivoj Ćeran
2.0 LSV

Artificer's Dragon | Artifact Creature | Dragon | Flying
{R}: Artifact creatures you control get +1/+0 until end of turn.
Unearth {3}{R}{R} ({3}{R}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.) | Leon Tukker