Portal

Casting Cost:

Flying

Cloud Dragon can block only creatures with flying.

Casting Cost:

Flying

When Ebon Dragon comes into play, you may have target opponent discard a card.

Casting Cost:

When Endless Cockroaches dies, return it to its owner's hand.

Casting Cost:

Flying

When Fire Dragon enters the battlefield, it deals damage to target creature equal to the number of Mountains you control.

Casting Cost:

If an opponent controls more lands than you, search your library for up to three Plains cards, reveal them, and put them into your hand. Then shuffle your library.

Casting Cost:

Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.

Casting Cost:

When Mercenary Knight enters the battlefield, sacrifice it unless you discard a creature card.

Casting Cost: 

As an additional cost to cast Natural Order, sacrifice a green creature.

Search your library for a green creature card and put it onto the battlefield. Then shuffle your library.

Casting Cost:

Search your library for a sorcery card and reveal that card. Shuffle your library, then put the card on top of it.

Casting Cost:

You may play up to three additional lands this turn.

Casting Cost: 

Each player shuffles the cards from his or her hand into his or her library, then draws that many cards.

Casting Cost: 

Destroy all creatures. They can't be regenerated.