Mana Leak

Counter target spell unless its controller pays {3}.

Thieving Magpie

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever Thieving Magpie deals damage to an opponent, draw a card.

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aven Fisher dies, you may draw a card.

Whenever a player casts a blue spell, you may gain 1 life.

{U}, {T}: You may tap or untap target creature.

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

Enchant permanent
You control enchanted permanent.

{3}, {T}: Rod of Ruin deals 1 damage to any target.

Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Return target permanent to its owner's hand.

Flying (This creature can't be blocked except by creatures with flying or reach.)
{1}{U}: Target player reveals the top card of their library.