Each creature you control with a +1/+1 counter on it has trample.
4 /
3
{3}{G}
Dragonscale Boon
Instant
Put two +1/+1 counters on target creature and untap it.
{1}{G}
Earthen Arms
Sorcery
Put two +1/+1 counters on target permanent.
Awaken 4--{6}{G} (If you cast this spell for {6}{G}, also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)
{G}
Experiment One
Creature - Human Ooze
Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Remove two +1/+1 counters from Experiment One: Regenerate Experiment One.
1 /
1
{3}{G}{G}
Mycoloth
Creature - Fungus
Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)
At the beginning of your upkeep, create a 1/1 green Saproling creature token for each +1/+1 counter on Mycoloth.
4 /
4
{G}
Nettle Sentinel
Creature - Elf Warrior
Nettle Sentinel doesn't untap during your untap step.
Whenever you cast a green spell, you may untap Nettle Sentinel.
2 /
2
{1}{G}{G}
Nissa, Voice of Zendikar
Legendary Planeswalker - Nissa
+1: Create a 0/1 green Plant creature token.
-2: Put a +1/+1 counter on each creature you control.
-7: You gain X life and draw X cards, where X is the number of lands you control.
L:
3
{2}{G}{G}
Peema Outrider
Creature - Elf Artificer
Trample
Fabricate 1 (When this creature enters the battlefield, put a +1/+1 counter on it or create a 1/1 colorless Servo artifact creature token.)
3 /
3
{2}{G}{G}
Phantom Centaur
Creature - Centaur Spirit
Protection from black
Phantom Centaur enters the battlefield with three +1/+1 counters on it.
If damage would be dealt to Phantom Centaur, prevent that damage. Remove a +1/+1 counter from Phantom Centaur.
2 /
0
{G}
Ranger's Guile
Instant
Target creature you control gets +1/+1 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
{4}{G}
Rhox Maulers
Creature - Rhino Soldier
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)
4 /
4
{4}{G}
Snapping Sailback
Creature - Dinosaur
Flash
Enrage -- Whenever Snapping Sailback is dealt damage, put a +1/+1 counter on it. (It must survive the damage to get the counter.)
4 /
4
{X}{G}
Thrive
Sorcery
Put a +1/+1 counter on each of X target creatures.
{2}{G}
Tireless Tracker
Creature - Human Scout
Landfall -- Whenever a land enters the battlefield under your control, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.
3 /
2
{G}
Tukatongue Thallid
Creature - Fungus
When Tukatongue Thallid dies, create a 1/1 green Saproling creature token.
1 /
1
{3}{G}{G}{G}
Vigor
Creature - Elemental Incarnation
Trample
If damage would be dealt to another creature you control, prevent that damage. Put a +1/+1 counter on that creature for each 1 damage prevented this way.
When Vigor is put into a graveyard from anywhere, shuffle it into its owner's library.