This Nymris, Oona's Trickster decklist has a theme of casting spells during opponents turns, and it features almost exclusively instant-speed plays
This decision aligns with Wizards of the Coast's approach to creature typing, where new types are introduced sparingly and typically only when a creature doesn't fit into existing categories
Despite that, the card effect, allowing its player to place 1 damage counter on each opposing character, is pretty effective
This deck has a bunch of cards that either produce tokens or creatures to recur so you can repeatedly sacrifice them to ping your opponents to death
The precon doesn't run a lot of "essential" cards to find each game like a combo deck would, but just a few flexible tutors can be a great help to find your single anti-graveyard card (Bojuka Bog) when you're up against a graveyard deck, or a board wipe, card draw, or whatever else when you need it
If, during your declare attackers step, Ursine Monstrosity is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since your turn began (and doesn't have haste), then it doesn't attack
