{2}{U}, {T}: Reveal any number of blue cards in your hand. Counter target spell unless its controller pays {1} for each card revealed this way.

{T}: Counter target spell unless its controller pays {1}.

Flying, protection from black Echo {3}{W}{W} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield.

Flying Sacrifice this creature: Counter target spell unless its controller pays {3}.

Flying (This creature can't be blocked except by creatures with flying or reach.) Sacrifice this creature: Counter target spell unless its controller pays {1}.

Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay {1}.

Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.

Whenever a player casts an instant spell, counter it unless that player pays {X}, where X is its mana value.

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.

Enchant creature Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost."

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

{U}: Tap target creature unless its controller pays {1}.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

{W}, Pay 2 life: The next time a source of your choice would deal damage to you this turn, prevent that damage.

You may return an Island you control to its owner's hand rather than pay this spell's mana cost. Counter target spell unless its controller pays {1}.

Counter target instant or sorcery spell unless its controller pays {1}. Draw a card.

Exile target attacking creature unless its controller pays {X}.

Counter target spell unless its controller pays {3}.