Like most Magic: The Gathering cards, the value of Arcane Signet depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secret Lair Drop)
When it's defeated, exile it, then cast it transformed.) When Invasion of Muraganda enters the battlefield, put a +1/+1 counter on target creature you control
Coming out of last week, the top decks included 2 copies of Amulet Bloom, a resurgent Jund build, a fairly stock Merfolk deck, Grixis Twin and two copies of R/G Tron, with the latter taking down the tournament
Card Tricks The following cards are the fundamental pieces of the green artifacts decks
From here we can add lands to match these percentages
There's not much more to say here than I think this card is a nice way for Control to snag an early engine card from these decks, and then have room to Stock Up or Consult the Star Charts on the following turn