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Try pairing a critical mass of 1-mana accelerants with powerful 3-drops like Oko, Thief of Crowns and Sentinel of the Nameless City
Simple, effective, versatile removal for Sapphire
They get it, sure, but its tapped until their turn, which they might not ever get in a Monument to Endurance deck
Closing Thoughts To summarize, here are a few maxims for deckbuilding: there are a few Item/Supporters cards you basically always want in your deck (Poke Ball, Professors Research, Potions, X Speed), some Supporters you usually want to include (Sabrina, Giovanni), and Supporters that are more situational but are incredible in certain decks (Misty, Erika, Blaine, Koga)
The more it goes the top, the more it is hard to get