Simian Spirit Guide

Exile Simian Spirit Guide from your hand: Add {R}.

Stinkdrinker Daredevil

Giant spells you cast cost {2} less to cast.

Swamp

Audacious Thief

Whenever Audacious Thief attacks, you draw a card and you lose 1 life.

Rakdos Guildgate

This land enters tapped.
{T}: Add {B} or {R}.

Thunderscape Familiar

First strike
Black spells and green spells you cast cost {1} less to cast.

Mountain

Read the Bones

Scry 2, then draw two cards. You lose 2 life. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Smash

Marshmist Titan

This spell costs {X} less to cast, where X is your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Squash

This spell costs {3} less to cast if you control a Giant.
Squash deals 6 damage to target creature or planeswalker.

Pharagax Giant

Tribute 2 (As this creature enters, an opponent of your choice may put two +1/+1 counters on it.)
When Pharagax Giant enters, if tribute wasn't paid, Pharagax Giant deals 5 damage to each opponent.

Tithebearer Giant

When Tithebearer Giant enters, you draw a card and you lose 1 life.

Hotheaded Giant

Haste
Hotheaded Giant enters with two -1/-1 counters on it unless you've cast another red spell this turn.

Nightscape Familiar

Blue spells and red spells you cast cost {1} less to cast.
{1}{B}: Regenerate Nightscape Familiar.

Cinderheart Giant

Trample
When Cinderheart Giant dies, it deals 7 damage to a creature an opponent controls chosen at random.

Hardened Berserker

Whenever Hardened Berserker attacks, the next spell you cast this turn costs {1} less to cast.