Heroes' Bane | Creature | Hydra | Heroes' Bane enters the battlefield with four +1/+1 counters on it.
{2}{G}{G}: Put X +1/+1 counters on Heroes' Bane, where X is its power. | Raymond Swanland
Nessian Game Warden | Creature | Beast | When Nessian Game Warden enters the battlefield, look at the top X cards of your library, where X is the number of Forests you control. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order. | Vincent Proce
Pheres-Band Thunderhoof | Creature | Centaur Warrior | Heroic — Whenever you cast a spell that targets Pheres-Band Thunderhoof, put two +1/+1 counters on Pheres-Band Thunderhoof. | Christopher Moeller
Fleetfeather Cockatrice | Creature | Cockatrice | Flash (You may cast this spell any time you could cast an instant.)
Flying, deathtouch
{5}{G}{U}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) | Matt Stewart
Kruphix, God of Horizons | Legendary Enchantment Creature | God | Indestructible
As long as your devotion to green and blue is less than seven, Kruphix isn't a creature.
You have no maximum hand size.
If you would lose unspent mana, that mana becomes colorless instead. | Daarken