Mana Short

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

Timetwister

Each player shuffles their hand and graveyard into their library, then draws seven cards. (Then put Timetwister into its owner's graveyard.)

Have

Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Mahamoti Djinn

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

Tundra

White Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything black.)

Control Magic

Enchant creature
You control enchanted creature.

Copy Artifact

You may have Copy Artifact enter as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types.

Northern Paladin

{W}{W}, {T}: Destroy target black permanent.

Mox Sapphire

Wrath of God

Destroy all creatures. They can't be regenerated.

Vesuvan Doppelganger

You may have Vesuvan Doppelganger enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability."

Balance

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Phantom Monster

Nevinyrral's Disk

Nevinyrral's Disk enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Braingeyser

Plains

Counterspell

Ancestral Recall

Disenchant

Psionic Blast

Psionic Blast deals 4 damage to any target and 2 damage to you.

Island

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

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.