At the beginning of combat on your turn, you may have Johan gain "Johan can't attack" until end of combat. If you do, attacking doesn't cause creatures you control to tap this combat if Johan is untapped.
{X}, {T}: Choose a card name. Target opponent reveals X cards at random from their hand. Then that player discards all cards with that name revealed this way. Activate only during your turn.
Flying At the beginning of your upkeep, sacrifice Nicol Bolas unless you pay {U}{B}{R}. Whenever Nicol Bolas deals damage to an opponent, that player discards their hand.
You may choose not to untap Rubinia Soulsinger during your untap step. {T}: Gain control of target creature for as long as you control Rubinia and Rubinia remains tapped.
When Stangg enters, create Stangg Twin, a legendary 3/4 red and green Human Warrior creature token. Exile that token when Stangg leaves the battlefield. Sacrifice Stangg when that token leaves the battlefield.
Flying At the beginning of your upkeep, sacrifice Vaevictis Asmadi unless you pay {B}{R}{G}. {B}: Vaevictis Asmadi gets +1/+0 until end of turn. {R}: Vaevictis Asmadi gets +1/+0 until end of turn. {G}: Vaevictis Asmadi gets +1/+0 until end of turn.
{T}, Sacrifice Ashnod's Transmogrant: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.
Ashnod found few willing to trade their humanity for the power she offered them.
{5}, Sacrifice Gauntlets of Chaos: Exchange control of target artifact, creature, or land you control and target permanent an opponent controls that shares one of those types with it. If those permanents are exchanged this way, destroy all Auras attached to them.