Just drop in and drop off
In later games, it also counterattacks by dishing out tons of damage, usually relating to the number of enemies that particular character has killed over the course of the game or other similar conditions
If you have a haste enabler, the Valkyrie will be able to tap once again to put her protection on Gerrard, allowing you to clear the board again whenever you get the chance
Karlach, Fury of Avernus (65k, prerelease foil $37) City on Fire (72k, FEA $7) Stranglehold (12k, Judge foil $8) Thrill of Possibility (228k, Mystical Archive 50) Dolmen Gate (38k, Lorwyn pack foil $120) City on Fire feels like it should have gotten there, but Karlach being in so many decks is a testament to the awesome ability to gain a second combat, with first strike added, for no cost beyond her own