Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Firebreathing

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of turn.

Iron Star

Whenever a player casts a red spell, you may pay {1}. If you do, you gain 1 life.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice this creature.

The Brute

Enchant creature
Enchanted creature gets +1/+0.
{R}{R}{R}: Regenerate enchanted creature.

Bird Maiden

Blood Lust

If target creature has toughness 5 or greater, it gets +4/-4 until end of turn. Otherwise, it gets +4/-X until end of turn, where X is its toughness minus 1.

Mountain

Dragon Whelp

Flying
{R}: Dragon Whelp gets +1/+0 until end of turn. If this ability has been activated four or more times this turn, sacrifice Dragon Whelp at the beginning of the next end step.

Dwarven Warriors

{T}: Target creature with power 2 or less can't be blocked this turn.

Hurr Jackal

{T}: Target creature can't be regenerated this turn.