If that creature is blocked by a black creature, which became white after it blocked, the ability will not be triggered
Standard almost makes sense as an Arena only format, because a lot of the supplemental products arent available on Arena, but then Arena created its own supplemental products and its own explicitly Arena only formats
A Shining Shoal for three from Legion Conquistador should be enough to swing any matchup that is interested in attacking you or burning your creatures
Ragavan, Nimble Pilferer specifications: Pros Cheap mana cost Hugely powerful Dash ability Source of mana and messes with your opponent's deck Cons A fairly expensive single Not as useful in Commander decks Ragavan, Nimble Pilferer is so explosively powerful that the card had to be banned in the Legacy and Historic MTG formats
This powerful Pokmon VSTAR can do more damage for each Pokmon in your discard pile, so your opponent should tread lightly
Getting to cast a 3/2 with haste and a powerful card like Liliana of the Veil or Tarmogoyf could turn a board state around almost immediately