Dimensional Door

Conjure {3}(If 3 or more +1/+1 counters have been
put on 1 or more creatures or a player has gained 3 or
more life this turn, this spell costs {3} less to cast.)
This spell costs {1} more to cast for each target
beyond the first.
If a spell or effect would damage a player and/or
1 or more creatures, put X +1/+1 counters
divided evenly, rounded down, among any
number of target creatures first. You gain X life.