Eminence gives you an ability even if Edgar isn't on the battlefield, giving you a 1/1 Vampire for every Vampire cast
If you trigger landfall in your first main phase, the extra combat will happen first and untap your creatures, but they'll remain tapped during your original combat phase
While white doesn't have the easiest time getting to threshold, I've heard that playing Armageddon plus good weenie creatures can be a viable strategy
Since only the cheapest creature, or creatures, are actually allowed in, this creates a weird race to the bottom
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The key to getting Cerberus to that attack power is to play a few spell cards to make it stronger than anything your opponent can throw at you because the AI will just set their monsters in defense mode and stay in a holding pattern