That's important to some players who want to customize their decks, but it's also safe to use it to consume cards
If you do choose to use Marshtomp in a deck, only use a 2-1 line of Mudkip and Marshtomp
The Doctor Who Timey-Wimey Commander Deck includes 1 ready-to-play Blue-Red-White deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), 10 Planechase cards, 1 six-sided planar die, a 2-card Collector Booster Sample Pack (contains 2 Traditional Foil or nonfoil special treatment cards, with 1 Common or Uncommon and 1 card of rarity Rare or higher), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card.
Finally, a 6/6 with flying and trample is nothing to sneeze at, and it can provide card advantage over time as it recurs cards and grows even bigger with its triggered ability
Its a trusted option in the MTG community and perfect if you want a simple, hands-off way to turn a big collection into cash