Plains

Prowling Felidar

Vigilance
Landfall — Whenever a land you control enters, put a +1/+1 counter on Prowling Felidar.

Cultivate

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Igneous Cur

{1}{R}: Igneous Cur gets +2/+0 until end of turn.

Pacifism

Enchant creature
Enchanted creature can't attack or block.

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.

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.

Explore

You may play an additional land this turn.
Draw a card.

Felidar Cub

Sacrifice Felidar Cub: Destroy target enchantment.

Rambunctious Mutt

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

Rin and Seri, Inseparable

Whenever you cast a Dog spell, create a 1/1 green Cat creature token.
Whenever you cast a Cat spell, create a 1/1 white Dog creature token.
{R}{G}{W}, {T}: Rin and Seri, Inseparable deals damage to any target equal to the number of Dogs you control. You gain life equal to the number of Cats you control.

Isamaru, Hound of Konda

Secure the Scene

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

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.

Wind-Scarred Crag

Wind-Scarred Crag enters tapped.
When Wind-Scarred Crag enters, you gain 1 life.
{T}: Add {R} or {W}.

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.)

Forest

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.

Release the Dogs

Create four 1/1 white Dog creature tokens.

Alpine Watchdog

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

Mountain

Supply Runners

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

Dauntless Onslaught

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

Outnumber

Outnumber deals damage to target creature equal to the number of creatures you control.

Evolving Wilds

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.