Elan, Courageous Blademaster

First Strike
When Elan attacks, if it is the only creature attacking, only one creature can block this turn.
When Elan is blocked by a creature, put a +1/+1 counter on Elan and a -1/-1 counter on the blocking creature.
Whenever Elan deals combat damage to a player, you may remove five +1/+1 counters from it. If you do, untap all creatures you control. After this phase, there is an additional combat phase.