Basically, dont make any assumptions before hopping in
Giving creatures the ability to attack or tap on the same turn they enter the battlefield under your control lets you quickly apply pressure to opponents through big stats, attack triggers, and powerful abilities the table would otherwise have a turn to respond to
While the majority of cards you could put in the 99 have a weight ranging from 0-45 in multiples of 9 (with the only exceptions being Tibalt's Trickery, with a weight of 180, and Zenith Flare, with a weight of 216), your commanders weight ranges from -360 at the weakest up to a whopping 1,800 at the top of the pack
Ensure your files are at least Technical Note: 300 DPI
Planar Nexus Planar Nexus is unremarkable on its own, but it's totally unique in that it helps bolster strategies based on undersupported land types, like locus, sphere, or desert
Solid, if unwieldy at six in Grixis