Being this large for this price at the time was an outstanding deal, even if nowadays it doesn't look like much, and the bonus life points were like adding insult to injury, causing players to wince looking at their hand that little bit more and do it again when you cast additional black spells
The game features more than 450 Digimon to collect, train and battle according to official Bandai Namco sources
It has a really cool restaurant and some very funny food lore/culture, including the loathed "Archon Loaf", a "bread" made to be nutritionally complete that contains things like fish and other things that should never be in a bread and is universally reviled
For actual Toon decks, it is still the cleanest way to reach whatever piece the hand is missing, whether that is the Field Spell, protection, a monster, or another search route into the next play
The other thing sleeves do is change how you handle cards