Tyrantrum's ability "Tyrannoguts" grants it 150 extra hp (up to a total of 330, which is a lot for a non-ex) if it has any special energy cards attached to it
The deck is fairly simple to learn, and the cards are extremely affordable, even on Master Duel , as Swordsoul only requires three Ultra Rare (UR) cards in the Main Deck and around seven URs in the Extra Deck
If you put an artifact onto the battlefield this way, put two +1/+1 counters on it
There's a smattering of cards that specifically interact with otters or make otters, and many of them are nice, efficient cards, even for a spellslinger deck with inexplicably few otters: Lilypad Village Valley Floodcaller Harnesser of Storms Otterball Antics Pearl of Wisdom Rockface Village Splash Portal Stormchaser's Talent Valley Flamecaller All of this adds up to an Izzet Prowess deck that features otters, which is awesome
Have you seen D/D/D Oblivion King Abyss Ragnark