Basalt Monolith doesn't untap during your untap step.
{T}: Add {C}{C}{C}.
{3}: Untap Basalt Monolith.
{9}
Darksteel Forge
Artifact
Artifacts you control have indestructible. (Effects that say "destroy" don't destroy them. Artifact creatures with indestructible can't be destroyed by damage.)
{3}
Foundry Inspector
Artifact Creature - Construct
Artifact spells you cast cost {1} less to cast.
3 /
2
{5}
Karn, Silver Golem
Legendary Artifact Creature - Golem
Whenever Karn, Silver Golem blocks or becomes blocked, it gets -4/+4 until end of turn.
{1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.
4 /
4
{4}
Karn, the Great Creator
Legendary Planeswalker - Karn
Activated abilities of artifacts your opponents control can't be activated.
+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.
-2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.
L:
5
{3}
Rings of Brighthearth
Artifact
Whenever you activate an ability, if it isn't a mana ability, you may pay {2}. If you do, copy that ability. You may choose new targets for the copy.
{3}
Staff of Domination
Artifact
{1}: Untap Staff of Domination.
{2}, {T}: You gain 1 life.
{3}, {T}: Untap target creature.
{4}, {T}: Tap target creature.
{5}, {T}: Draw a card.
{4}
Thran Dynamo
Artifact
{T}: Add {C}{C}{C}.
{4}
Unwinding Clock
Artifact
Untap all artifacts you control during each other player's untap step.