Cephalid Retainer

{U}{U}: Tap target creature without flying.

Borrowing 100,000 Arrows

Draw a card for each tapped creature target opponent controls.

Sapphire Medallion

Blue spells you cast cost {1} less to cast.

Verity Circle

Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card.
{4}{U}: Tap target creature without flying.

Willbreaker

Whenever a creature an opponent controls becomes the target of a spell or ability you control, gain control of that creature for as long as you control this creature.

Flood

Aboshan, Cephalid Emperor

Tap an untapped Octopus you control: Tap target permanent.
{U}{U}{U}: Tap all creatures without flying.

Archetype of Imagination

Creatures you control have flying.
Creatures your opponents control lose flying and can't have or gain flying.

Cephalid Broker

{T}: Target player draws two cards, then discards two cards.

Cephalid Constable

Whenever this creature deals combat damage to a player, return up to that many target permanents that player controls to their owner's hand.

Theft of Dreams

Wonder

Flying
As long as this card is in your graveyard and you control an Island, creatures you control have flying.