Synex, Timelord

+2: create a 4/4 Illusion dragon with "when this creature blocks give it -2/-0 when it attacks give it a +1/+1 counter"
-3: deal 5 damage to 5 creatures divided as you chose tap those creatures they do not untap until your next end step
-10: take an extra turn after this one if you have 15 or more loyalty counters on Synex then take 2 turns instead