Merfolk (Simic Splash)Pro's:
-Lot's of interaction (Tidebinder, Trickster, Harbinger,
Spell Pierce)
-Lot's of Devotioin for Thassa and
Master of Waves-8 Lords for pumping up +1+1
-card advantage through Silvergill, Thopter and Icon
Con's:
Alot of dead cards vs non-creature Decks, but the devotion makes up for it (For
Master of Waves and Thassa)
Strategy:
Straight up aggro trying to get creatures big (Lords) and get blockers out of the way (trickster, harbinger, tidebinder). In longer games Thassa, Copter and
Master of Waves will get the job done. Also some suprise Spell-Pierces for Planeswalker's etc.
Good Opening Hand:
2 Lands, Kuema Speaker and double Mistbinder +
MutavaultDeck did pretty well as of October 2019, sideboard is still experimental as the meta hasn't formed yet.
Have fun and leave a like :-)