In a metagame where graveyard recursion strategies like Amber Emerald Dogs are everywhere, this is a massive advantage because it prevents the opponent from simply bringing their threat back to life the following turn
Further Reading: CUT #23 Finals Aragorn vs Merry and Pippin Should You Play The One Ring In cEDH
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I feel very confident in modelling the first to always be 14.4 per box (2 in 5 packs), which means the sequence length of 10 boxes (as opposed to 6 boxes used to model Gen I-V sets) comes in handy
The last effect is hardly helpful, pretty much only if you have Plaguespreader in your hand (or Spirit Reaper, if you run that), and what you Summon is likely to die before you can use it
(2) During your Main Phase: You can place 1 Atlantis, the Dragon City or Umi from your Deck face-up in your Field Zone