If I wasnt the threat, Id allow them to build a big board and take out my opponents, then come in with the sweeper
In a multiplayer game, the ability checks whether you're the defending player for each individual attacking creature
If you find only one card, you'll shuffle it into your library and exile Emergent Ultimatum without casting anything
Graveyard commanders are a pretty broad topic: There are commanders that care about casting spells from graveyards, that let you cast spells from graveyards, reanimator commanders, discard commanders, self-mill commanders, and other ways to fill the graveyard if your strategy touches the graveyard, theres a commander for it
Hooded Hydra - Flexible Arachnogenesis - A personal pet card, no one see's it coming
Testing with a foil scrap showed that a single 10 second cycle produced substantially less wrinkling and cracking