The full rule text has been interpreted in different ways, but the gist is that whenever an opponent casts a creature, the ability triggers if that creatures color doesnt match a color of creature you control
Promo Info OMNIMON BINDER SET [PB-19] CLOSECLOSE BT14-014 SR Digimon Lv.5 Parallel Rare MetalGreymon ACE Color Red Form Ultimate Attribute Vaccine Type Cyborg DP 8000 Cost 4 Digivolve Cost 1 3 from Lv.4 Digivolve Cost 2 - Upper Text [Digivolve] Lv.4 w/[Greymon] in name: Cost 3 [Hand][Counter] Blast Digivolve (One of your Digimon may digivolve into this card without paying the cost.) [On Play][When Digivolving] Delete 1 of your opponent's Digimon with 6000 DP or less
#20 Note, Zacama only untaps lands if you hardcast it from hand #21 Note, Zacama only untaps lands if you hardcast it from hand Aw sad times
You could do this without spending any mana on turn two, which also meant that you had mana available to counter any sort of disruption your opponent might attempt
If you really want to go all out here you could pick up all 3 for a nice display
Around 39 When building a Commander deck, your land count plays a critical role in ensuring your strategy runs smoothly