Elvish Handservant

Whenever a player casts a Giant spell, you may put a +1/+1 counter on this creature.

Quakebringer

Your opponents can't gain life.
At the beginning of your upkeep, Quakebringer deals 2 damage to each opponent. This ability triggers only if Quakebringer is on the battlefield or if Quakebringer is in your graveyard and you control a Giant.
Foretell {2}{R}{R}

Two-Headed Giant

Whenever this creature attacks, flip two coins. If both coins come up heads, this creature gains double strike until end of turn. If both coins come up tails, this creature gains menace until end of turn.

Giant Harbinger

When this creature enters, you may search your library for a Giant card, reveal it, then shuffle and put that card on top.

Giant's Ire

Giant's Ire deals 4 damage to target player or planeswalker. If you control a Giant, draw a card.

Hired Giant

When this creature enters, each other player may search their library for a land card and put that card onto the battlefield. Then each player who searched their library this way shuffles.

Awaken the Ancient

Enchant Mountain
Enchanted Mountain is a 7/7 red Giant creature with haste. It's still a land.

Furystoke Giant

When this creature enters, other creatures you control gain "{T}: This creature deals 2 damage to any target" until end of turn.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Calamity Bearer

If a Giant source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Giant Trap Door Spider

{1}{R}{G}, {T}: Exile this creature and target creature without flying that's attacking you.

Cunning Giant

If this creature is unblocked, you may have it assign its combat damage to a creature defending player controls.

Magma Giant

When this creature enters, it deals 2 damage to each creature and each player.

Thundercloud Shaman

When this creature enters, it deals damage equal to the number of Giants you control to each non-Giant creature.

The Lady of the Mountain

Giant Adephage

Trample
Whenever this creature deals combat damage to a player, create a token that's a copy of this creature.

Earthshaker Giant

Trample
When this creature enters, other creatures you control get +3/+3 and gain trample until end of turn.

Stinkdrinker Daredevil

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

Karplusan Giant

Tap an untapped snow land you control: This creature gets +1/+1 until end of turn.

Borderland Behemoth

Trample
This creature gets +4/+4 for each other Giant you control.

Crush Underfoot

Choose a Giant creature you control. It deals damage equal to its power to target creature.

Sunrise Sovereign

Other Giant creatures you control get +2/+2 and have trample.

Two-Headed Giant of Foriys

Trample
This creature can block an additional creature each combat.

Impelled Giant

Trample
Tap an untapped red creature you control other than this creature: This creature gets +X/+0 until end of turn, where X is the power of the creature tapped this way.