Trample

When Arborback Stomper enters the battlefield, you gain 5 life.

Whenever Deepwood Tantiv becomes blocked, you gain 2 life.

Whenever a creature you control mutates, put a +1/+1 counter on that creature and you gain 2 life.

Whenever you sacrifice a Clue, you gain 3 life.

When you cast this spell, you gain half X life and draw half X cards. Round down each time.

Flying, trample

Hydroid Krasis enters the battlefield with X +1/+1 counters on it.

When Obstinate Baloth enters the battlefield, you gain 4 life.

If a spell or ability an opponent controls causes you to discard Obstinate Baloth, put it onto the battlefield instead of putting it into your graveyard.

When Provisions Merchant enters the battlefield, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

Whenever Provisions Merchant attacks, you may sacrifice a Food. If you do, attacking creatures get +1/+1 and gain trample until end of turn.

If you control a Forest, rather than pay this spell's mana cost, you may have each other player gain 5 life.

When Sylvan Brushstrider enters the battlefield, you gain 2 life.

Uurg, Spawn of Turg's power is equal to the number of land cards in your graveyard.

At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

, Sacrifice a land: You gain 2 life.