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From MTG Wiki
Abandon is a keyword action which is only used in the Archenemy format. Together with set in motion it is used to interact with Schemes.
From the Comprehensive Rules (Ixalan (September 29, 2017))
- 701.24. Abandon
- 701.24a Only a face-up ongoing scheme card may be abandoned, and only during an Archenemy game. See rule 312, “Schemes,” and rule 904, “Archenemy.”
- 701.24b To abandon a scheme, turn it face down and put it on the bottom of its owner’s scheme deck.
From the glossary of the Comprehensive Rules (Ixalan (September 29, 2017))
- To turn a face-up ongoing scheme card face down and put it on the bottom of its owner’s scheme deck. See rule 701.24, “Abandon.”