Theyre kind of like lands that you pay mana for, but theyre beneficial because they speed your game plan up to generate more mana early
Whenever one or more cards leave your graveyard, you may create a 1/1 black and green Insect creature token, then put a number of +1/+1 counters on it equal to the greatest mana value among those cards
As midrange and control strategies inevitably claim a larger share of the meta, Elsa becomes an essential tool for breaking board stalls and closing games
Demonic Covenant's last ability will only cause you to sacrifice Demonic Covenant if both cards have the exact same combination of card types
That totally works too
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on