Have

Release the Dogs

Create four 1/1 white Dog creature tokens.

Affa Guard Hound

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

Isamaru, Hound of Konda

Blink Dog

Double strike
Teleport — {3}{W}: This creature phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

Dauntless Onslaught

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

Trusty Retriever

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

Selfless Savior

Sacrifice this creature: Another target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Rambunctious Mutt

When this creature enters, destroy target artifact or enchantment an opponent controls.

Cathar's Companion

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

Thriving Heath

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

Dogs

Alpine Watchdog

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

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Pack Leader

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

Secure the Scene

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

Plains

Supply Runners

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

Loyal Warhound

Vigilance
When this creature enters, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle.