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"I was told these were standard issue

Okay, you want a Merfolk deck, heres a Merfolk deck: Creatures (16) Planeswalkers (2) Lands (22) Spells (20) 4 Shock 4 Harnessed Lightning 4 Attune with Aether 1 Confiscation Coup 1 Aethersphere Harvester 2 Abrade 4 Chart a Course Sideboard Temur Energy is going to leave its filthy prints in a lot of indecent places, if you know what I mean

In fact, Erebus itself has its own graveyard effect by discarding a Monarch spell/trap you can return one Monarch from your graveyard to your hand, allowing you to use those powerful on-summon Monarch effects all over again

They also cost one mana less for each card type in your graveyard

6 Gideon Jura The first Gideon to ever see print, Gideon first appeared as Gideon Jura in Rise of the Eldrazi, immediately setting the standard of what players expect from this Planeswalker