Mana Abundance

If a player would add mana, instead all players add that mana.

Barry's Land

Wrath of Sod

Put a manabond counter on all creatures. (They lose all other abilities and become lands with "{T}: Add one mana of this card's color.")

High Troller

All targeted spells and abilities cost {2} less and have their targets chosen randomly.

How to Keep an Izzet Mage Busy

Return How to Keep an Izzet Mage Busy to its owner's hand.

Red Herring

{1}{U}: Exchange Red Herring from your hand with a permanent you control on the battlefield or a spell you control on the stack. If that permanent or spell was the target of a spell or ability, change that target to Red Herring.

Mirrored Lotus

Reflect {0} (As this enters, each opponent may pay {0}. When they do, they create a token copy of this except it lacks this ability.)
{T}, Exile Mirrored Lotus: Add three mana of any one color.

Priority Avenger

Flying
Players can't cast instant spells unless a spell or ability is on the stack.