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.

Flying, deathtouch

When Dragonlord Silumgar enters the battlefield, gain control of target creature or planeswalker for as long as you control Dragonlord Silumgar.

You may choose not to untap Helm of Possession during your untap step.

, , Sacrifice a creature: Gain control of target creature for as long as you control Helm of Possession and Helm of Possession remains tapped.

At the beginning of your upkeep, sacrifice two Swamps. If you can't, tap Infernal Denizen, and an opponent may gain control of a creature you control of their choice for as long as Infernal Denizen remains on the battlefield.

: Gain control of target creature for as long as Infernal Denizen remains on the battlefield.

First strike, haste

Whenever Kellogg, Dangerous Mind attacks, create a Treasure token.

Sacrifice five Treasures: Gain control of target creature for as long as you control Kellogg. Activate only as a sorcery.

Merieke Ri Berit doesn't untap during your untap step.

: Gain control of target creature for as long as you control Merieke Ri Berit. When Merieke Ri Berit leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.

When Nihiloor enters the battlefield, for each opponent, tap up to one untapped creature you control. When you do, gain control of target creature that player controls with power less than or equal to the tapped creature's power for as long as you control Nihiloor.

Whenever you attack with a creature an opponent owns, you gain 2 life and that player loses 2 life.

Flying

: Olivia Voldaren deals 1 damage to another target creature. That creature becomes a Vampire in addition to its other types. Put a +1/+1 counter on Olivia Voldaren.

: Gain control of target Vampire for as long as you control Olivia Voldaren.

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

: For as long as Preacher remains tapped, gain control of target creature of an opponent's choice they control.

: Gain control of target creature for as long as that creature is enchanted.

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

, : Unless an opponent pays , gain control of target artifact for as long as Scarwood Bandits remains on the battlefield.

Flying

When Sower of Temptation enters the battlefield, gain control of target creature for as long as Sower of Temptation remains on the battlefield.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Gain control of target creature for as long as The Akroan War remains on the battlefield.

II — Until your next turn, creatures your opponents control attack each combat if able.

III — Each tapped creature deals damage to itself equal to its power.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Gain control of target non-Mutant creature for as long as you control Vault 87.

II — Put a +1/+1 counter on target creature you control. It becomes a Mutant in addition to its other types.

III — Draw cards equal to the greatest power among Mutants you control.

Kicker and/or

Vodalian Mindsinger enters the battlefield with two +1/+1 counters on it for each time it was kicked.

When Vodalian Mindsinger enters the battlefield, gain control of target creature with power less than Vodalian Mindsinger's power for as long as you control Vodalian Mindsinger.