Brainstorm by paying ({U} magic symbol) , causing you to draw three cards and then put two cards from your hand onto the top of your library. Ensure the top card will be
Venser.
Cast Dack by paying ({4} magic symbol) ({W} magic symbol) ({W} magic symbol) . When it enters, it triggers, revealing
Venser from your library, then putting it onto the battlefield goaded, and then giving control of
Venser to an opponent.
When
Venser enters, it triggers, creating two token copies of
Venser as the original
Venser is under an opponent's control.
Put all but one
Venser into your graveyard due to the legend rule.
The two
Venser tokens' abilities each trigger.
Resolve the first trigger, creating two token copies of
Venser.
Repeat from step 4.
Notes
The remaining
Venser triggers can choose either mode as desired and change targets as desired. This can create additional results like infinite artifact tokens, artifact ETB and landfall triggers.
Results
Infinite artifact ETB.
Infinite artifact tokens.
Infinite copies of permanents opponents control.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature tokens with haste.
Infinite death triggers.
Infinite landfall triggers.
Metadata
In 2 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).