+Arcum (5)
: Target artifact creature's controller sacrifices it. That player may search their library for a noncreature artifact card, put it onto the battlefield, then shuffle.
( can be paid with one mana from a snow source.)
When Arcum's Astrolabe enters, draw a card.
, : Add one mana of any color.
, : Target creature gains vigilance until end of turn. Activate only during combat and only if defending player controls a snow land.
, : Target snow land is no longer snow.
, : Target nonsnow basic land becomes snow.
, : Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay , where X is that mana value. If they don't pay, the creature attacks this turn if able, and at the beginning of the next end step, destroy it if it didn't attack this turn. Activate only before attackers are declared.
Gatherer works better in the Companion app!