Theilysa, Stormtide Ascendant

Companion — Your starting deck contains a
legendary blue card of each type. (If this card is
your chosen companion, you may cast it once from
outside the game.)
Theilysa gets +1/+1 for each spell you've cast
this turn.
{t}: Add an amount of {u} equal to the number
of instants and sorceries you've cast this turn.
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"Talrand's masterwork cloaks me in bounty, granting
me the skin of the sea."