Kraseus, Linebreaker Hero

Whenever a creature you control attacks alone,
create a Forerunner Role token attached to it. (Enchanted creature gets +1/+1 and has "At the beginning of your upkeep, sacrifice this Role and
draw a card.")
Whenever Kraseus deals combat damage to a
player, you may sacrifice a Role attached to it. If
you do, after this phase, there is an additional
combat phase. Creatures you control gain first
strike until end of turn.