There are other cards that give a similar ability to it, but this one is a bit cheaper than most, and it also makes your Creatures hench, which is a lovely bonus
Fortunately, your choice here doesn't matter too much, as you can eventually unlock all three starter decks as you play through the missions
Card Text 2 [Inherited Effect] [Your Turn][Once Per Turn] When you play a Digimon with [Four Great Dragons] in its traits or place a [Trial of the Four Great Dragons] in your battle area, 1 of your opponent's Digimon gets -3000 DP for the turn
So, casting Saw in Half on of your opponents beefy threats and casting Cheer as a follow up later in the game is a great play to have at your disposal, especially if youre having trouble finding your combo pieces right away
Like other playstyles, this is a great way for players to gradually introduce themselves to more complex systems