Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

: Add one mana of any color.

: Add .
: Add one mana of any color. Spend this mana only to cast a legendary spell.
: Add one mana of any color among legendary permanents you control.
, , Exile this land: Target legendary creature gains hexproof and indestructible until end of turn.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
You can't lose the game this turn and your opponents can't win the game this turn. Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead.

: Add .
: Add . Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi.

Berzerker — Khârn the Betrayer attacks or blocks each combat if able.
Sigil of Corruption — When you lose control of Khârn the Betrayer, draw two cards.
The Betrayer — If damage would be dealt to Khârn the Betrayer, prevent that damage and an opponent of your choice gains control of it.

Blue spells you cast cost less to cast.

: Add .
, : Put target artifact card from your graveyard on top of your library.

Choose a card name. Exile the top six cards of your library, then reveal cards from the top of your library until you reveal a card with the chosen name. Put that card into your hand and exile all other cards revealed this way.

Lifelink
Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
At the beginning of each of your postcombat main phases, if you gained 3 or more life this turn, exile Sorin, then return him to the battlefield transformed under his owner's control.

Each spell costs more to cast except during its controller's turn.

When Azog enters, destroy up to one other target creature. Its controller amasses Goblins X, where X is that creature's power. If you controlled that creature, draw a card. (To amass Goblins X, that player puts X +1/+1 counters on an Army they control. It's also a Goblin. If they don't control an Army, they create a 0/0 black Goblin Army creature token first.)

This creature enters with up to two shoe counters on it. Use your shoes as counters.
This creature gets +1/+1 for each shoe counter on it.

As this land enters, choose a basic land type. Then you may pay 2 life. If you don't, it enters tapped.
This land is the chosen type.

Creatures you control have ": Add one mana of any color."

: Add one mana of any color in your commander's color identity.

Whenever you cast a spell from your graveyard, draw a card.

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

White spells you cast cost less to cast.