Knowing when to quest, when to challenge, when you use your actions, etc
(See rule 509, "Declare Blockers Step.") (If the defending player has a land that matches the type of landwalk the creature has, that creature is unblockable
In addition you can always reach me on the MTGGoldfish Discord Server and the Vintage Streamers Discord
Nadier's Nightblade exists solely as a win condition for token strategies, often in the context of combos with cards like Chatterfang, Squirrel General or any of the many, many ways you can make infinite Treasure tokens
Moving counters around can also break cards that are balanced by their respective counter type
When setting out to build a silly fun deck it is rather a surprise when it puts up a competitive showing