(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)

Spree (Choose one or more additional costs.)

+ {2}{U} — Each player shuffles their hand and graveyard into their library, then draws seven cards.

+ {1}{U} — Take an extra turn after this one.

+ {U} — Target player draws three cards.

Changeling

Whenever a player draws their second card, exile target instant or sorcery card from your graveyard and put a page counter on it.

Whenever a player casts their second spell during their turn, you may cast a spell from among cards in exile with page counters on them without paying its mana cost.

+1: This card can be your commander.

create a 3/3 green Dinosaur creature token.

-2: Put three +1/+1 counters on the target creature you control. another target planeswalker loses 1 loyalty coumter.

-7: You get an emblem with "Whenever you create a Dinosaur creature token, put two +1/+1 counters on it

Flying, (This creature can't be blocked except by creatures with flying or reach.)