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While it isn't game breaking, playing Naban, Dean of Iteration on Turn 2 into Sunscourge Champion on Turn 3 to gain four life is a nice value start for a Naban deck, especially considering that Sunscourge Champion can come back to gain eight life later in the game thanks to eternalize

It has lower HP at the 70 mark, but it is considered a basic Pokemon, so it can be used as early as turn 1 to help set up poisons and disrupt the enemy from the get-go

It's not surprising Yu-Gi-Oh

As the third most common type, many allow you to pay mana to charge up some special ability

This frog is a great self-mill commander since any card that goes into your graveyard gets a croak counter. These counters let you play them from your graveyard, which means any mill card is now a card-positive cantrip