Syr Konrad, the Grim will hit each opponent for each creature card milled into their graveyard, turning your regular 99-card mill into a two-pronged attack
Protecting ElshaElsha at level one, going wide at level two, and making ElshaElsha massive and double strikey to end the game, or to start to rebuild after a board wipe
Many a player has unwisely split a Fact or Fiction the wrong way, losing the game on the spot
[18] [19] Lands, enchantments, artifacts, creatures, planeswalkers, and battle cards are considered "permanents" as they remain in play until removed by other spells, ability, or combat effects
A lot of them are specific to their own archetypes and dont really stand out above the rest
Be it a reanimator deck that needs self-mill, a storm deck, or a Splinter Twin + Pestermite combo deck, blue is usually involved somehow