Menace When Horned Stoneseeker enters the battlefield, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") When Horned Stoneseeker leaves the battlefield, sacrifice a Powerstone.

{1}, Sacrifice a Scarecrow: Draw a card. {4}, {T}: Return target artifact creature card from your graveyard to the battlefield.

Trample Steel Exemplar enters the battlefield with two +1/+1 counters on it unless two or more colors of mana were spent to cast it.

{3}{R}: You may put an artifact card from your hand onto the battlefield. That artifact gains haste. Sacrifice it at the beginning of the next end step.

Enchant creature Enchanted creature has menace and "Whenever this creature deals combat damage to a player, create a Treasure token." (It can't be blocked except by two or more creatures. The token is an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") When enchanted creature dies, draw a card.

Trample {3}{R}, Sacrifice an artifact: Bosh, Iron Golem deals damage equal to the sacrificed artifact's mana value to any target.

Defender, indestructible {10}: Monstrosity 10. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.) As long as Colossus of Akros is monstrous, it has trample and can attack as though it didn't have defender.

When Portal to Phyrexia enters the battlefield, each opponent sacrifices three creatures. At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control. It's a Phyrexian in addition to its other types.

Excavation Explosion deals 3 damage to any target. Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")

At the beginning of your precombat main phase, add {B} for each charge counter on Altar of Shadows. {7}, {T}: Destroy target creature. Then put a charge counter on Altar of Shadows.

Trample When you cast this spell and whenever Cityscape Leveler attacks, destroy up to one target nonland permanent. Its controller creates a tapped Powerstone token. Unearth {8}

Defender (This creature can't attack.) When a creature attacks you or a planeswalker you control, if Guardian of the Ages has defender, it loses defender and gains trample.

{1}{U}{U}: Target permanent becomes an artifact in addition to its other types. (This effect lasts indefinitely.) {3}{U}: Gain control of target artifact. (This effect lasts indefinitely.)

Phyrexian Colossus doesn't untap during your untap step. Pay 8 life: Untap Phyrexian Colossus. Phyrexian Colossus can't be blocked except by three or more creatures.

Prototype {3}{G}{G} — 3/5 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Reach, trample

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery. Spells you cast of the chosen type cost {1} less to cast.

Whenever Dragonspark Reactor or another artifact enters the battlefield under your control, put a charge counter on Dragonspark Reactor. {4}, Sacrifice Dragonspark Reactor: It deals damage equal to the number of charge counters on it to target player and that much damage to up to one target creature.

{T}: Add {R}. Put a stash counter on Glittering Stockpile. {T}, Sacrifice Glittering Stockpile: Add X mana of any one color, where X is the number of stash counters on Glittering Stockpile.

Haste {1}, {T}, Discard a card: Draw a card. Whenever you discard one or more artifact cards, add {R}{R}. This ability triggers only once each turn.