Card

Venser, Shaper Savant

Mana cost {2}{U}{U}

Flash (You may cast this spell any time you could cast an instant.) When Venser enters, return target spell or permanent to its owner's hand.

Part of 112 known combos, 2 of them two-card. 6 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Intruder Alarm, Approach of the Second Sun
B2 Core — Not in the same deck as its two-card combo partners: Intruder Alarm, Approach of the Second Sun
B3 Upgraded — Not in the same deck as its early two-card combo partner: Intruder Alarm
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Intruder Alarm, Approach of the Second Sun (early with Intruder Alarm)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

112 known combos, 2 of them two-card.

Peregrine Drake + Panharmonicon + Venser, Shaper Savant
Produces: Infinite creature ETB, Infinite creature LTB, Infinite mana lands you control can produce
View on Commander Spellbook
Peregrine Drake + Venser, Shaper Savant + Starfield Vocalist
Produces: Infinite creature LTB, Infinite creature ETB, Infinite storm count
View on Commander Spellbook
Peregrine Drake + Virtue of Knowledge // Vantress Visions + Venser, Shaper Savant
Produces: Infinite creature LTB, Infinite creature ETB, Infinite storm count
View on Commander Spellbook

2021-03-19 · Wizards of the Coast
If a copy of a spell is returned to its owner's hand, it's moved there, then it will cease to exist as a state-based action. It can't be recast.
2021-03-19 · Wizards of the Coast
If Venser's triggered ability targets a spell cast with flashback, that spell will be exiled instead of returning to its owner's hand.
2021-03-19 · Wizards of the Coast
If a spell is returned to its owner's hand, it's removed from the stack and thus will not resolve. The spell isn't countered; it just no longer exists. This works even against a spell that can't be countered.
2017-03-14 · Wizards of the Coast
If Venser's triggered ability targets a spell cast with flashback, that spell will be exiled instead of returning to its owner's hand.
2017-03-14 · Wizards of the Coast
If a copy of a spell is returned to its owner's hand, it's moved there, then it will cease to exist as a state-based action. It can't be recast.
2017-03-14 · Wizards of the Coast
If a spell is returned to its owner's hand, it's removed from the stack and thus will not resolve. The spell isn't countered; it just no longer exists. This works against a spell that can't be countered.

Rulings: Scryfall · Wizards of the Coast