It blocks most things, protects your Planeswalkers, and helps slow the game down
Athreos, God of Passage Athreos, Shroud-Veiled Bane, Lord of Darkness Bast, Panther Goddess Djeru and Hazoret Eirdu, Carrier of Dawn Ephara, Ever-Sheltering Ephara, God of the Polis God-Eternal Oketra Halvar, God of Battle Havi, the All-Father Heliod, God of the Sun Heliod, Sun-Crowned Heliod, the Radiant Dawn Heliod, the Warped Eclipse Hydaelyn, the Mothercrystal Iroas, God of Victory Karametra, God of Harvests Ketramose, the New Dawn Myrkul, Lord of Bones Ojer Taq, Deepest Foundation Oketra the True Reidane, God of the Worthy The Mighty Thor, Jane Foster Thor Odinson Tiamat Tom Bombadil Valkyrior Skyrider
From the standard operation of fishing for Summons, there seem to be various curveballs like fishing for Great Masters or "Omniscience." In any case, milling is essential, so you want to increase your options with green elements
The Epic cards may not feature new artwork, but the glimmer and shine on them and the open air card frame will still make them something worth pulling
Lot of great stuff you can snag for 5 mana