mtg mom most expensive cards Bloomburrow: The Top 10 most expensive

Lightning Bolt paired with a massive trample creature is horribly hard to deal with

CardMill can sort alphabetically (by first letter), by set, color, type, rarity and price

Just sacrifice a trivial merfolk token after each swing and you can easily complete a victory lap of the table (or set up a different win con) over several consecutive turns

Make good use of on-color utility lands where possible, and be more sparing with colorless lands

The fact that Unsettled Mariner also counters abilities and not just spells can put a hamper on any sort of enter-the-battlefield effects your opponents might be playing

In general, Planeswalkers and other noncreature threats tend to be good sideboard cards against slow decks