Sol Ring

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Clairvoyance

Look at target player's hand.
Draw a card at the beginning of the next turn's upkeep.

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Prodigal Sorcerer

{T}: Prodigal Sorcerer deals 1 damage to any target.

Mana Drain

Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.

Island

Twiddle

You may tap or untap target artifact, creature, or land.

Unsummon

Return target creature to its owner's hand.

Mishra's Factory

{T}: Add {C}.
{1}: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Urza's Bauble

{T}, Sacrifice Urza's Bauble: Look at a card at random in target player's hand. You draw a card at the beginning of the next turn's upkeep.

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

Ancestral Recall

Obsianus Golem

Control Magic

Enchant creature
You control enchanted creature.

Boomerang

Return target permanent to its owner's hand.

Flying Men

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Colossus of Sardia

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Colossus of Sardia doesn't untap during your untap step.
{9}: Untap Colossus of Sardia. Activate only during your upkeep.