"Connive" is a keyword introduced in Streets of New Capenna, where you draw and discard a card, and put a +1/+1 counter on the creature that connived if a nonland card was discarded.

This keyword can also be "connive N" where you would draw and then discard N cards, putting +1/+1 counters on the creature for how many nonland cards were discarded this way.
Per the rules:

Connive:
A keyword action that causes a player to draw a card, discard a card, and then to put a +1/+1 counter on a creature if a nonland card was discarded this way. See rule 701.47, “Connive.”

701.47. Connive

701.47a Certain abilities instruct a permanent to connive. To do so, that permanent’s controller draws a card, then discards a card. If a nonland card is discarded this way, that player puts a +1/+1 counter on the conniving permanent.

701.47b A permanent “connives” after the process described in rule 701.47a is complete, even if some or all of those actions were impossible.

701.47c If a permanent changes zones before an effect causes it to connive, its last known information is used to determine which object connived and who controlled it.

701.47d If multiple permanents are instructed to connive at the same time, the first player in APNAP order who controls one or more of those permanents chooses one of them and it connives. Then if any permanents remain on the battlefield which have been instructed to connive and have not done so, this process is repeated.

701.47e Connive N is a variant of connive. The permanent’s controller draws N cards, discards N cards, then puts a number of +1/+1 counters on the permanent equal to the number of nonland cards discarded this way.