Infantry Shield attached to a creature you control with power 5 or greater that does not have summoning sickness).
Notable Prerequisites
An opponent cannot block and kill creatures you control.
Steps
Declare the creature that has
Infantry Shield attached as an attacker. The creature triggers, creating a number of 1/1 Warrior creature tokens that are tapped and attacking equal to the creature's power.
During your postcombat main phase, activate
Phyrexian Altar five times by sacrificing five Warriors, adding ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Activate
Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing you to untap all creatures you control and to get an additional combat and main phase after this one.