Card

Double Major

Mana cost {G}{U}

Copy target creature spell you control, except it isn't legendary if the spell is legendary. (A copy of a creature spell becomes a token.)

Part of 56 known combos, 3 of them two-card. 2 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Vadrok, Apex of Thunder, Kiki-Jiki, Mirror Breaker, Omarthis, Ghostfire Initiate
B2 Core — Not in the same deck as its two-card combo partners: Vadrok, Apex of Thunder, Kiki-Jiki, Mirror Breaker, Omarthis, Ghostfire Initiate
B3 Upgraded — Not in the same deck as its early two-card combo partner: Omarthis, Ghostfire Initiate
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Vadrok, Apex of Thunder, Kiki-Jiki, Mirror Breaker, Omarthis, Ghostfire Initiate (early with Omarthis, Ghostfire Initiate)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

56 known combos, 3 of them two-card.

2021-04-16 · Wizards of the Coast
The token that a resolving copy of a spell becomes isn’t said to have been “created.”
2021-04-16 · Wizards of the Coast
If a creature spell is copied, it’s put onto the battlefield as a token as the spell resolves rather than putting the copy of the spell onto the battlefield. The rules that apply to a permanent spell becoming a permanent apply to a copy of a spell becoming a token.

Rulings: Scryfall · Wizards of the Coast