Telepathy

Your opponents play with their hands revealed.

Engineered Plague

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

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

Return target creature to its owner's hand.

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

Return all green permanents to their owners' hands.

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

Flying
When Cloudchaser Eagle enters the battlefield, destroy target enchantment.

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

Tremor deals 1 damage to each creature without flying.

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

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

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

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

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