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This is a no-brainer, but theres just no best booster to buy because it all depends on your need

While losing ink from your inkwell may seem like a deficit, the cards are returned to your hand, giving you back some of the options you may have sacrificed in the early game to gain ink

Guidelight Synergist

In addition to forcing each player to skip their discard phase, Anvil of Bagardan grants each player an additional draw at the beginning of their draw phase, but then they must choose and discard a card from their hand, offering those playing with graveyard shenanigans the free discard outlet they would have gotten at the end of the turn but now just at the beginning, meaning they could take advantage of it during their respective turns

X counterspells scale as the game goes on, allowing them to remain relevant, and this one even exiles it's target

This enchantment allows you to exile cards in each of your upkeeps, and during each of your turns, you can play a land that's been exiled with the permanent - so either Jacob or his Insight