It costs a lot of mana, though lets you destroy any permanent for no downside, which in certain decks can come up
It's not that each card is hard to understand in isolation, the comprehension complexity on them often is low, but rather it's hard to understand how they all interact together
BG has only one Outlast creature, so its worse at grinding out value and being flexible than GW, It tries to make up for this speed (its Unleash creatures force it to be the aggressor), but cards like Rakdos Drake and Dead Reveler just arent as powerful as what GW offers
Once per battle 004 allows the player to discard a monster from their deck to give Deskbot 004 500 ATK and DEF for each level the monster was
If your Commander is low cost and likes to attack a lot, like Giada or Adeline, then Tome of Legends should draw you a lot of cards each game
A surprise booster pack comes in right in the middle of the list and its bringing some serious bucks