Most likely Beza will see play as an ultra strong sideboard card
The Brothers War Jumpstart boosters come in one of ten themes, and when you put them together, anything can happen
When Hei Bai leaves the battlefield, put its counters on target creature you control
Goblins can also afford a high curve as it has Skirk Prospector to add mana, Warchief to reduce costs and two kinds of Lackey to put things directly into play.

Esper Midrange Decklist 75 Cards Total including sideboard Creatures 19 4x Dennick, Pious Apprentice 3x Faerie Mastermind 2x Tenacious Underdog 4x Raffine, Scheming Seer 3x Sheoldred, the Apocalypse Planeswalkers 5 2x Kaito Shizuki 3x The Wandering Emperor Instants 9 3x Cut Down 3x Go for the Throat 3x Make Disappear Enchantments 4 4x Wedding Announcement Lands 26 2x Adarkar Wastes 2x Caves of Koilos 4x Darkslick Shores 1x Eiganjo, Seat of the Empire 1x Island 1x Otawara, Soaring City 3x Plaza of Heroes 3x Raffines Tower 2x Restless Fortress 2x Seachrome Coast 3x Shattered Sanctum 1x Takenuma, Abandoned Mire 1x Underground River Sideboard 15 1x Cut Down 2x Duress 2x Destroy Evil 2x Disdainful Stroke 1x Negate 2x Siphon Insight 2x Unlicensed Hearse 1x Glistening Deluge 1x Sheoldred 1x Farewell MTGArena Esper Midrange: How it plays Cut Down and Go for the Throat are cheap, effective removal instants, and the set of three Make Dissapears work as efficient multi-target counters

Before the top thirteen however I am going to talk about the cards that are not on the list but have had a little cube love in their time