Harbinger of C'Thulhu

0: Elder spells you cast cost 1 less to cast. (This isn't a loyalty ability)
+1: Reveal the top three cards of your library. Put up to one Elder card from among them into your hand, and the rest into your graveyard.
-3: Put a madness counter on target creature. (You choose how creatures with madness counters attack and block each combat)