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At the beginning of your upkeep, you may put a Doctor creature card from your hand onto the battlefield

Because if you are able remove all of the defense counters on the battle and destroy it, it triggers and allows you to cast it flipped for free, giving you Serra Faithkeeper

The Frog Token could be beneficial in a deck that focuses on token generation, creature sacrifice, or synergy with tribal themes such as Merfolk or Elves

Bolas's Citadel synergizes with the small lifegain subtheme in this deck as you can pay life to play spells off the top of your library for more card advantage

[37] These restrictions are usually imposed for balance-of-power reasons but have been occasionally made because of gameplay mechanics