Lune, Elemental Dancer

Defender, Hexproof

Whenever you gain life, destroy a permanent, a source you control deals damage, apply +1/+1 counters, play a creature spell, counter a spell
or draw a card, gain {e}.

•Pay 4 {e}: Copy target spell you control.
•Pay 8 {e}: Take an extra turn after this one.
•Pay 16 {e}: Target player loses 40 life.