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Rally works wonderfuly with Heimer. I aways get it. With heal, you can make hard pushs also. Don't even need Improved Rally. With Presence of the Master you can use Rally and Heal more often.
Aegis of the Legion also helps a lot your minions and turrets.
Sometimes I even get stark to lower the armor of squishes so towers does even more damage.
Heimer is sooo versatile =D