High Tide

Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.

Seething Song

Krark, the Thumbless

Whenever you cast an instant or sorcery spell, flip a coin. If you lose the flip, return that spell to its owner's hand. If you win the flip, copy that spell, and you may choose new targets for the copy.
Partner (You can have two commanders if both have partner.)

Dangerous Wager

Null Brooch

{2}, {T}, Discard your hand: Counter target noncreature spell.

Helm of Awakening

Pyretic Ritual

Desperate Ritual

Add {R}{R}{R}.
Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)