The Battle of 100 Dragons

Until end of turn: — All creatures you control
have Battle Cry. — Whenever a creature you
control deals combat damage to an opponent,
you may draw a card. — Whenever a creature
an opponent controls dies, creatures you control
get +1/+1. {line} Whenever one or more creatures
you control deal combat damage to an opponent,
untap all creatures you control. After this phase,
there is an additional combat phase.
{line} All creatures able to block do so.