how do companion cards work mtg

how do companion cards work mtg keyword guide and best am i understanding this right?

Name: how do companion cards work mtg keyword guide and best am i understanding this right?
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Working in more of the +1/+1 counter synergies from green

Rampant Frogantua's second ability counts players who lost the game before Rampant Frogantua entered the battlefield

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Angels: They're Just Like Us but Cooler and with Wings This Secret Lair Commander Deck brings the heavens to your LGS under the guidance of Bruna, the Fading Light