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[Your Turn] When one of your red or yellow Tamers is suspended, this Digimon gains [Security Attack +1] (This Digimon checks 1 additional security card) for the turn

This commander has well-supported creature types, a cool use of mentor, explosive potential with mass counter-granting abilities, and exists in colors that dont often get played as a +1/+1 counter deck

You also get counters on all of your existing creatures, which can be a big swing

However, there are better alternatives like Dragon Ravine for Dragon decks or Simorgh, Bird of Sovereignty for Winged Beast decks that provide more specific and powerful effects

Entomb and Reanimate are two Legacy staples that Modern is (thankfully) missing

Jowgen prevents Special Summons, and can destroy all monsters the opponent controls if you discard a card