There are no hard and fast rules when it comes to selling bulk Pokmon cards, but as with many things, the first step can be daunting
I use this term loosely but am mostly looking for card draw or any spell that nets me 2+ non-land cards in hand / directly into play 10 sources of "card advantage;" split between creature / artifact / enchantment removal 6 targeted removal, creature-light decks might want one more, creature-heavy decks might want one less 3 board wipes
When you look to supplementary products for EDH, the cards get even stronger
Outpost Siege has another option if you dont need a card advantage
Appa, Steadfast Guardian's Value in MTG $55.53 for a Borderless foil version $39.32 for Borderless non-foil $24.85 for regular non-foil 8 8 - Ozai, the Phoenix King Ozai, the Phoenix King is a Rakdos card in MTG that costs 6 mana total (2 generic, 2 Black, 2 Red) for a 7/7 creature with trample, haste, and firebending 4
You are guaranteed one foil Sorcerer Avatar in the fixed packet mentioned above