Thriving Heath

Thriving Heath enters tapped. As it enters, choose a color other than white.
{T}: Add {W} or one mana of the chosen color.

Release the Dogs

Create four 1/1 white Dog creature tokens.

Supply Runners

When Supply Runners enters, put a +1/+1 counter on each other creature you control.

Cathar's Companion

Whenever you cast a noncreature spell, Cathar's Companion gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Pack Leader

Other Dogs you control get +1/+1.
Whenever Pack Leader attacks, prevent all combat damage that would be dealt this turn to Dogs you control.

Rambunctious Mutt

When Rambunctious Mutt enters, destroy target artifact or enchantment an opponent controls.

Dauntless Onslaught

Up to two target creatures each get +2/+2 until end of turn.

Alpine Watchdog

Vigilance (Attacking doesn't cause this creature to tap.)

Isamaru, Hound of Konda

Plains

Secure the Scene

Exile target nonland permanent. Its controller creates a 1/1 white Soldier creature token.

Affa Guard Hound

Flash (You may cast this spell any time you could cast an instant.)
When Affa Guard Hound enters, target creature gets +0/+3 until end of turn.

Trusty Retriever

When Trusty Retriever enters, choose one —
• Put a +1/+1 counter on Trusty Retriever.
• Return target artifact or enchantment card from your graveyard to your hand.