The Specific Cards Are Not Format Appropriate Sometimes certain cards eventually become inappropriate for the format over time even if you have built the deck correctly in the past
Duskwatch Recruiter is cheaper and digs deeper per activation, but as a way of making infinite-mana wins deterministic, Nylea works just as well
You can also look at Crimson Muckwader (3/2 for two mana), Deathbellow Raider (2/3 for two mana), and Sedge Sliver (3/3 for three mana) as red creatures that can regenerate for black mana and are better choices than Viashino Skeleton
In most cases, a deck wont run any Supporter-based Search cards, so if youre not sure what cards to include here, its probably safe to just skip these cards altogether
(Equipment, Auras you control, and counters are modifications.) Illustrated by Bastien Grivet Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp