Read More: The 10 Best Demons In Commander 4 Massacre Girl Massacre Girl is a Legendary Creature
[Deck Title= Simic Henge Baker Neenan] [Creatures] 4 Emry, Lurker of the Loch 4 Ornithopter 4 Gilded Goose 2 Vantress Gargoyle 2 Rhonas the Indomitable [/Creatures] [Spells] 4 The Great Henge 4 Springleaf Drum 2 Once Upon a Time 4 Ensoul Artifact 4 Oko, Thief of Crowns 3 Heart of Kiran [/Spells] [Lands] 6 Island 6 Forest 4 Breeding Pool 4 Botanical Sanctum 3 Darksteel Citadel [/Lands] [Sideboard] 2 Veil of Summer 2 Metallic Rebuke 1 Emrakul, the Promised End 3 Phyrexian Revoker 4 Tireless Tracker 3 Stubborn Denial [/Sideboard] [/Deck] Look, were probably not going to get Emry banned by slotting it into independently broken decks, so lets just try to cast it on turn one and go from there
Put a +1/+1 counter and a lifelink counter on that creature and a +1/+1 counter and a lifelink counter on Arwen
If you let them use Aether Vial to generate mana, they can start producing things that get in the way faster than you can answer them
Maybe you turn them into a mana dork with something like Battery Bearer, Cryptolith Rite, or Citanul Hierophants, or tap them as part of the cost of an ability like Springleaf Drums
This gives you a real-time snapshot of what other collectors are willing to pay
