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Putting a creature onto the battlefield attacking as the ability resolves will cause the ability to trigger again
Adelbert Steiner Cecil, Dark Knight Cecil, Redeemed Paladin Dion, Bahamut's Dominant Freya Crescent Garland, Knight of Cornelia Judge Magister Gabranth Kain, Traitorous Dragoon Seifer Almasy Squall, SeeD Mercenary Summon: Brynhildr Summon: Knights of Round Summon: Primal Odin
1 Rest in Peace and 1 Stony Silence provide important tutor targets for Artifact and graveyard-focused matchups (decks like Dredge or Affinity)
using a card like Jace, the Mind Sculptor to put a Time Warp or other extra turn spell on top of your library turn after turn offers infinite turns