Players create a token that's a copy of the creature under control, before sacrificing it at the beginning of the next step
In a deck with over 40 artifacts, that can take you from no army to a pretty scary army in fairly short order and it can be tutored up with Treasure Mage, which is also in the deck
Arcane Denial is one of the best but Mana Leak is plenty good too
Wear // Tear Wear / Tear primarily resides in sideboards, but its a nice sideboard card
(To behold a Merfolk, choose a Merfolk you control or reveal a Merfolk card from your hand.) When this creature enters, create a 1/1 white and blue Merfolk creature token
This card has been a monster burn spell when it was around in Standard before, and theres no reason to think things will be any different now