The grandeur ability lets you get more swamps to make you even bigger and get you more mana
Each of them offers a buff to your creatures with a single specific creature type
While putting them directly into play is admittedly more efficient, theres really no downside with Merens ability only good scenarios and better ones
That said, other recent Blogatog posts outline the problems with returning to this particular well
This set featured reprints from many of the original Pokmon TCG sets released throughout 1999 and 2000 and included a unique reverse holofoil pattern, known by fans as the firework pattern for its burst-like design
Often when people point out these combos, they look more impressive than they actually are, because they rely on a perfect combination of cards which you'll seldom draw, even with a couple of mulligans