While toughness is typically a measure of a creature's defensive ability, the printing of cards like Assault Formation, which allow creatures to assign damage equal to their toughness, has made these creatures sought after for toughness-themed decks
This deck has 16 ways to get more cards, all of which sit on the field doing it painfully slowly because that's the burden we've chosen with this primal surge nonsense
The only pure Sea Serpent archetype is Atlantean, which is often paired with Mermail
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The Ur-Dragon is potentially the most powerful Dragon commander with its 'eminence' ability making the rest of your Dragons one generic mana less to cast, even if The Ur-Dragon isn't on the battlefield
The best quick play spell is Runick Tip due to the sheer versatility of the card, and it reads as follows: Activate 1 of these effects, but skip your next Battle Phase after activation