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'For each opponent, you create a 2/1 black Villain creature token with menace. Whenever your commander enters or attacks, you may pay {1}{B}. If you do, return this card from...
'Reach Ulvenwald Hydra's power and toughness are each equal to the number of lands you control. When this creature enters, you may search your library for a land card, put...
'Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional {G}.
'Trample
This creature enters with X +1/+1 counters on it.
When this creature dies, you gain life and draw cards equal to its power.
'Trample
This creature enters with four +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on each creature you control.
'Fading 5 (This creature enters with five fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.) {1}, Remove...
'{X}{X}{G}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, create X X/X green Hydra creature tokens.
'Each land is a Forest in addition to its other land types.
'Target creature gets +3/+3 until end of turn.
This creature enters with X +1/+1 counters on it.
{2}{G}, Remove a +1/+1 counter from this creature: Destroy target artifact or enchantment.
'Double strike
This creature enters with X +1/+1 counters on it.
{1}{R/G}: Put a +1/+1 counter on this creature. Activate only as a sorcery.
'This creature enters with X +1/+1 counters on it.
Whenever one or more +1/+1 counters are put on another non-Hydra creature you control, put a +1/+1 counter on this creature.