Plateau

Chandra's Magmutt

{T}: Chandra's Magmutt deals 1 damage to target player or planeswalker.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Alpine Watchdog

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

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.

King of the Pride

Isamaru, Hound of Konda

Plains

Giant Growth

Target creature gets +3/+3 until end of turn.

Generous Stray

Savannah

Savannah Lions

Nature's Lore

Search your library for a Forest card, put that card onto the battlefield, then shuffle.

Mountain

Harmonize

Revitalize

Forest

Worldly Tutor

Search your library for a creature card, reveal it, then shuffle and put the card on top.