A Siege Rider Minion was an advanced minion that resulted from casting the non-dominion version of the summoner spell Promote on any nearby minion. It was removed from gameplay along with Promote due to balancing issues where several players in a team would simultaneously Promote regular minions into those Siege Rider Minions in a single lane, granting them enormous pushing power in that lane.
Trivia
The purple siege rider minion is holding a rally banner which is also known as
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