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Complete the Circuit

Instant

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
You may cast sorcery spells this turn as though they had flash.
When you next cast an instant or sorcery spell this turn, copy that spell twice. You may choose new targets for the copies.

CMC
6
Mana cost
{5}{U}
Color identity
U
Rarity
rare
Set
March of the Machine
Price
$0.38
EDHREC rank
#9006
Buy on TCGplayer
Complete the Circuit card art
Complete the Circuit drops an instant-speed extra turn onto the stack and gives every creature you control flying until end of turn — the five-mana cost is steep, but the ceiling is a lethal alpha strike out of nowhere. In Kasla, the Broken Halo builds it's a cornerstone piece, and Biovisionary decks can use the extra turn to close the win condition they couldn't stick the previous turn.

Best Commanders

Commanders with the highest synergy

01
Kasla, the Broken Halo

Kasla, the Broken Halo

29.2% of decks · synergy 0.28

Kasla, the Broken Halo's spell-rebound engine means Complete the Circuit can generate multiple extra turns off a single cast, which is exactly the kind of runaway value that closes games before opponents can stabilize.

02
Ovika, Enigma Goliath

Ovika, Enigma Goliath

23.1% of decks · synergy 0.22

Ovika, Enigma Goliath turns every noncreature spell into a Goblin token army, so Complete the Circuit pays for the extra turn in bodies and then gives those bodies flying to swing lethal in the same sequence.

03
Vadrik, Astral Archmage

Vadrik, Astral Archmage

18.3% of decks · synergy 0.17

Vadrik, Astral Archmage slashes spell costs based on power, and a reduced Complete the Circuit becomes trivially castable mid-game — often for two or three mana — making the extra turn essentially free once Vadrik is set up.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is where Complete the Circuit earns its slot: extra turns are powerful enough to close games, and the incidental flying anthem turns sideways attacks into lethal windows that catch opponents unprepared. In Modern and Pioneer, it competes against a dense field of cheaper, more reliable extra-turn spells and doesn't see meaningful play. Legacy and Vintage have access to so many broken alternatives that Complete the Circuit is invisible there. Oathbreaker, like Commander, rewards the extra-turn effect at the right power band, and decks with spell-cost reduction can make it genuinely threatening.

Key Combos

Combo lines featuring this card

Price Context

Current price

$0.38 bulk tier

At $0.38, Complete the Circuit sits firmly in bulk territory — you're paying almost nothing for a card with a real ceiling in the right shell. Bulk extra-turn spells don't tend to spike unless a commander breaks them wide open, so treat it as a cheap pickup for the decks that want it rather than a spec.

Explore

Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.