These allies did receive a keyworded mechanic Rally, which meant that you got some kind of trigger whenever any Ally entered the battlefield
If you have them, play every possible fetchland in Boros, but if you're a poor musician like me, Cabaretti CourtyardCabaretti Courtyard, Evolving WildsEvolving Wilds, Fabled PassageFabled Passage, Myriad LandscapeMyriad Landscape, and Terramorphic ExpanseTerramorphic Expanse will do the job
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As long as one or more lands were milled this way, you'll create a Treasure token
Sacrificing a measly 1/1 to kill any creature or planeswalker is fantastic removal
Since rules aren't enforced automatically, players must manage everything themselves, making Untap.in feel more like a virtual tabletop than a guided game client