For Eiganjo Dynastorian, thats Replenish, a card thats on the Reserved List because its considered gently forbidden from use
Looking at the price history graph, from TCGplayer, Collector Booster Boxes were $600 at their absolute cheapest
It immediately doubles mana output and can activate right away, digging for game-ending threats like Hullbreaker Horror
Krark, the Thumbless In fourth is everybodys favorite goblin, Krark, the Thumbless
You see, when the creature returns from the graveyard, and if you have a way to remove the -1/-1 counter, say, with Vizier of RemediesVizier of Remedies or Renata, Called to the HuntRenata, Called to the Hunt, you can put together all kinds of loops that trigger off things dying and entering the battlefield, and you can easily go off with sacrifice outlets like Altar of DementiaAltar of Dementia and Ashnod's AltarAshnod's Altar