Hall of echo did not copy creature
I used Hall of Echos pay five to copy a creature that did NOT have summoning sickness. It sacrificed the land and then did NOT make a copy of the creature.
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vote
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Rezzahan#77802
commented
That creature was most likely a base 0/0. Since copying does not copy counters, that land became a 0/0 creature and was put into the graveyard for having 0 toughness.