Saboteurs are creatures that reward you for dealing combat damage to a player, usually through card advantage, theft, discard, or another disruptive effect. The term is informal rather than a printed keyword.
Ohran Frostfang gives your attacking creatures card-draw triggers, while Toski, Bearer of Secrets does something similar across your entire team. Evasion abilities such as flying, menace, and unblockability help saboteurs connect reliably.