Caltrops

Whenever a creature attacks, Caltrops deals 1 damage to it.

Blood Pet

{3}: Patagia Golem gains flying until end of turn.

Flying
When Sage Owl enters, look at the top four cards of your library, then put them back in any order.

You may have Thorn Elemental assign its combat damage as though it weren't blocked.

Cast this spell only during your end step.
As an additional cost to cast this spell, pay X life.
Draw X cards.

Return target creature to its owner's hand.

{2}, {T}: Draw a card, then discard a card.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Whenever Hollow Dogs attacks, it gets +2/+0 until end of turn.

Flying
When Cloudchaser Eagle enters, destroy target enchantment.

As Engineered Plague enters, choose a creature type.
All creatures of the chosen type get -1/-1.

Whenever a land is put into a graveyard from the battlefield, Dingus Egg deals 2 damage to that land's controller.

Tremor deals 1 damage to each creature without flying.

Return all green permanents to their owners' hands.

Search your library for a basic land card, put that card onto the battlefield, then shuffle.

Your opponents play with their hands revealed.

Spitting Earth deals damage to target creature equal to the number of Mountains you control.