Forest

Have

Burdened Stoneback

This creature enters with two -1/-1 counters on it.
{1}{W}, Remove a counter from this creature: Target creature gains indestructible until end of turn. Activate only as a sorcery. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it still dies.)

Island

Brambleback Brute

This creature enters with two -1/-1 counters on it.
{1}{R}, Remove a counter from this creature: Target creature can't block this turn. Activate only as a sorcery.

Mountain

Pummeler for Hire

Vigilance, reach
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
When this creature enters, you gain X life, where X is the greatest power among Giants you control.

Hall of Storm Giants

If you control two or more other lands, this land enters tapped.
{T}: Add {U}.
{5}{U}: Until end of turn, this land becomes a 7/7 blue Giant creature with ward {3}. It's still a land. (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)

Plains

Rimeshield Frost Giant

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)