With a healthy amount of HP, Entei can stick around in your Active Spot to help draw you cards with its Fleet-Footed ability, letting you draw a card once per turn
There are only a few decks where this won't matter, and it can get rid of a Pokmon on the bench that your opponent thought was safe
Amazoness Sage X EARTH Level 4 [ Warrior / Effect ] ATK 1400 DEF 700 At the end of the Damage Step, if this card attacked and is still on the field: Target 1 Spell/Trap your opponent controls
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Limitations: Because of their loose fit, cards can slide around inside a standard penny sleeve
This means that on my turn I'll have all my mana untapped, while they still have a bunch of countermagic mana tapped