Time ticks away

Whenever a creature you control Attacks, put a +1+1 counter on Time ticks away .
When there are 20 +1+1 counters on Time ticks away,
{t}, choose one:
•Sacrifice Time ticks away and put all the +1+1 counters on your choice of creatures you control.
•Sacrifice Time ticks away and deal 20 damage to target opponent.