Reinforcements (9)
Create two 2/2 white Knight Ally creature tokens.
Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
Other Spirits you control have melee.
Prevent all noncombat damage that would be dealt to Spirits you control.
Create two 2/1 red Dwarf Berserker creature tokens.
Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Flying, ward
When Grey Host Reinforcements enters, exile target player's graveyard. Put a number of +1/+1 counters on Grey Host Reinforcements equal to the number of creature cards exiled this way.
Create two 1/1 white Soldier creature tokens. Until end of turn, creatures you control get +1/+1 and gain haste. (They can attack and this turn.)
Create two 1/1 blue and red Elemental creature tokens.
Put up to three target creature cards from your graveyard on top of your library.
Flash (You may cast this spell any time you could cast an instant.)
When this creature enters, create a 1/1 white Soldier creature token.
If you have less life than an opponent, you gain 6 life. If you control fewer creatures than an opponent, create three 1/1 white Soldier creature tokens.
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