As Ancient Amphitheater enters the battlefield, you may reveal a Giant card from your hand. If you don't, Ancient Amphitheater enters the battlefield tapped.

: Add or to your mana pool.

(Ancient Den isn't a spell.)

: Add to your mana pool.

Fading 5 (This creature enters the battlefield with five fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)

, Remove a fade counter from Ancient Hydra: Ancient Hydra deals 1 damage to target creature or player.

Ancient Ooze's power and toughness are each equal to the total converted mana cost of other creatures you control.

: Regenerate Ancient Silverback. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Ancient Spring enters the battlefield tapped.

: Add to your mana pool.

, Sacrifice Ancient Spring: Add to your mana pool.

: Add one mana of any color to your mana pool. Spend this mana only to cast creature spells.

Flying

Whenever you cast an enchantment spell, put a +1/+1 counter on each creature you control.

When an opponent casts an enchantment spell, if Hidden Ancients is an enchantment, Hidden Ancients becomes a 5/5 Treefolk creature.

Sacrifice Kami of Ancient Law: Destroy target enchantment.

Trample

Cumulative upkeep—Put a +1/+1 counter on a creature an opponent controls. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Kicker (You may pay an additional as you cast this spell.)

Saproling creatures and other Treefolk creatures get +1/+1.

When Verdeloth the Ancient enters the battlefield, if it was kicked, put X 1/1 green Saproling creature tokens onto the battlefield.

: Yavimaya Ancients gets +1/-2 until end of turn.