Whenever Grma deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card
It also shuts down several sources of card advantage like cascade or anything that allows players to cast spells from exile like Jeska's Will
If Whiplash is no longer on the battlefield when his last triggered ability resolves, use the number of Equipment that were attached to him as he last existed on the battlefield to determine the value of X
For example, card draw (Cunning Rhetoric, Enchantress's Presence) removal (Grasp of Fate, Cast Out) and bodies (Sigil of the Empty Throne, Sandwurm Convergence)
Lastly, while it requires a steep loyalty investment, Szat's -10 ability allows its controller to gain control of each player's commander, even gaining control of those within their respective Command Zones