mtg card serach Rules Text: search, your, library, for, a, mountain, 45 cards When the last is removed Spellseeker

Once Mishra's Factory is an Assembly-Worker, it is a legal target for its last ability

Riveteers Requisitioner

It also combos well with board wipes or Nevinyrral's Disk-style effects to let you clear the board while you keep your own stuff intact

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Ive long loved Warkite Marauder, which can turn off the abilities of problematic creatures when it attacks, and combined with tapping down other blockers, it can really open up attack lanes

If you search for effects that can untap Kiki-Jiki like Pestermite with the Recruiter, this could easily lead to a Splinter Twin situation. Recruiter of the Guard from the MTG Mystery Booster set is currently worth about $21