You may choose not to untap Ashnod's Battle Gear during your untap step.

, : Target creature you control gets +2/-2 for as long as Ashnod's Battle Gear remains tapped.

You may choose not to untap Callous Oppressor during your untap step.

As Callous Oppressor enters the battlefield, an opponent chooses a creature type.

: Gain control of target creature that isn't of the chosen type for as long as Callous Oppressor remains tapped.

You may choose not to untap Deserter's Quarters during your untap step.

, : Tap target creature. It doesn't untap during its controller's untap step for as long as Deserter's Quarters remains tapped.

You may choose not to untap Endoskeleton during your untap step.

, : Target creature gets +0/+3 for as long as Endoskeleton remains tapped.

You may choose not to untap Everglove Courier during your untap step.

, : Target Elf creature gets +2/+2 and has trample for as long as Everglove Courier remains tapped.

You may choose not to untap Flowstone Armor during your untap step.

, : Target creature gets +1/-1 for as long as Flowstone Armor remains tapped.

You may choose not to untap Ghosthelm Courier during your untap step.

, : Target Wizard creature gets +2/+2 and has shroud for as long as Ghosthelm Courier remains tapped. (It can't be the target of spells or abilities.)

You may choose not to untap Hedge Whisperer during your untap step.

, , Collect evidence 4: Target land you control becomes a 5/5 green Plant Boar creature with haste for as long as Hedge Whisperer remains tapped. It's still a land. Activate only as a sorcery. (To collect evidence 4, exile cards with total mana value 4 or greater from your graveyard.)

You may choose not to untap Hisoka's Guard during your untap step.

, : Target creature you control other than Hisoka's Guard has shroud for as long as Hisoka's Guard remains tapped. (It can't be the target of spells or abilities.)

Hollow Trees enters the battlefield tapped.

You may choose not to untap Hollow Trees during your untap step.

At the beginning of your upkeep, if Hollow Trees is tapped, put a storage counter on it.

, Remove any number of storage counters from Hollow Trees: Add for each storage counter removed this way.

You may choose not to untap Ice Floe during your untap step.

: Tap target creature without flying that's attacking you. It doesn't untap during its controller's untap step for as long as Ice Floe remains tapped.

You may choose not to untap Mana Leech during your untap step.

: Tap target land. It doesn't untap during its controller's untap step for as long as Mana Leech remains tapped.

You may choose not to untap Old Man of the Sea during your untap step.

: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power.

You may choose not to untap Phyrexian Gremlins during your untap step.

: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped.

You may choose not to untap Rubinia Soulsinger during your untap step.

: Gain control of target creature for as long as you control Rubinia and Rubinia remains tapped.

Sand Silos enters the battlefield tapped.

You may choose not to untap Sand Silos during your untap step.

At the beginning of your upkeep, if Sand Silos is tapped, put a storage counter on it.

, Remove any number of storage counters from Sand Silos: Add for each storage counter removed this way.

When you control no Islands, sacrifice Seasinger.

You may choose not to untap Seasinger during your untap step.

: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.

You may choose not to untap Tawnos's Coffin during your untap step.

, : Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When Tawnos's Coffin leaves the battlefield or becomes untapped, return that exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it. If you do, return the other exiled cards to the battlefield under their owner's control attached to that permanent.

Shadow (This creature can block or be blocked by only creatures with shadow.)

You may choose not to untap Thalakos Dreamsower during your untap step.

Whenever Thalakos Dreamsower deals damage to an opponent, tap target creature. That creature doesn't untap during its controller's untap step for as long as Thalakos Dreamsower remains tapped.

You may choose not to untap The Pandorica during your untap step.

, : Untap another target nonland permanent, then it phases out. It can't phase in for as long as The Pandorica remains tapped. When The Pandorica becomes untapped or leaves the battlefield, that permanent phases in. Activate only as a sorcery.

You may choose not to untap Vedalken Shackles during your untap step.

, : Gain control of target creature with power less than or equal to the number of Islands you control for as long as Vedalken Shackles remains tapped.

You may choose not to untap Willow Satyr during your untap step.

: Gain control of target legendary creature for as long as you control Willow Satyr and Willow Satyr remains tapped.

You may choose not to untap Zelyon Sword during your untap step.

, : Target creature gets +2/+0 for as long as Zelyon Sword remains tapped.