Originally Posted by
Parcher
I guess I'll field this one. I run Griz mainly just to act as a far, far better Sphinx of Lost Truths. It's for any match where I just need to combo as quickly as possible. His stats are just a bonus. His secondary use is against some decks like Miracles. Where they might threaten Terminus and you want to use his ability to just draw and refill your hand in case they can follow up the sweeper with GY hate. Technically, you can also do some absurd, win-more stuff with Firestorm. I've had six+ zombies trapped under an Ensnaring Bridge vs Painter. Dread Griz, draw 14(up to 19), play a second land, Firestorm for 8, in response Firestorm for 8.
Rider is primarily there for Lands. They have so many different ways to mess with us that we can't interact with that Rider just blows through. They can have both Tabernacle and Chasm set up, and you can remove Chasm, and even let Tabernacle remove itself during your next upkeep. And since it exiles, they can't get either of those singletons back. It's also there for decks where you might not worry about direct hate, but need to deal with other permanents. Painter for instance might have only 1 RiP and 1 Crypt, which you might deal with, and then they drop Bridge. Rider is great against Sneak for obvious reasons. But they sometimes run Leyline of Sanctity. Your plan is to rip apart their hand to stop their combo primarily. So you can Show in Rider, or you can go off, Rider away their Leyline, and rip their hand apart. It's also immune to Karakas vs Miracles or DnT. I often use it vs Miracles just to hit lands. To guarantee they can't Terminus, or play RiP. It's also the safest target vs. Reanimator since you don't care about them getting it much. The life loss from Reanimate hurts them far more than a 5/5 hurts you, and the exile trigger is poor. He only comes in about 5-6 matchups. But if you Griselbrand into Rider by turn two, there is no realistic combination of cards any deck could put together to beat that.