If you have a way to tap Gran-Gran outside of attacking, such as Springleaf Drum, you can reliably dig through your deck every turn
Impulse draws are Boross most common means of card draw, so you can pack additional support like Kami of Celebration with this creature to build a synergistic draw engine that supports many Boros archetypes
It's pricey both to put onto the battlefield and to activate its ability, but it's worth doing turn after turn where you can cycle through a bunch of creatures for huge value swings that can end games on the spot if done correctly
For more, check out our Best Equipment and Best Budget Equipment articles
With the Dimir colors you can also focus on controlling the board with cards like Drown in the Loch, Fatal Push, and March of Wretched Sorrow
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