Befuddle

Target creature gets -4/-0 until end of turn.
Draw a card.

Frilled Sea Serpent

{5}{U}{U}: Frilled Sea Serpent can't be blocked this turn.

Waterknot

Enchant creature
When Waterknot enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Snapping Drake

Flying (This creature can't be blocked except by creatures with flying or reach.)

Aven Wind Mage

Flying
Whenever you cast an instant or sorcery spell, Aven Wind Mage gets +1/+1 until end of turn.

Divination

Sleep

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

Tolarian Scholar

Island

Uncomfortable Chill

Creatures your opponents control get -2/-0 until end of turn.
Draw a card.

Air Elemental

Mist-Cloaked Herald

Wall of Mist

Riddlemaster Sphinx

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Riddlemaster Sphinx enters, you may return target creature an opponent controls to its owner's hand.