In other words, if you cast Bloodbraid Elf with Flash during your opponent's End Step and flip into an Ichor Wellspring, you can cast the Ichor Wellspring (though you'll draw the card off the Wellspring's Enters effect before the Elf resolves!)
particularly, when other Elf cards are played, theres an immediate bonus, and the fact that you can add any mana to it to then cast spells and activate abilities could make for a devastating combo, if played correctly
The design leans towards multi-hit pulls and strong demand with collectors, which is why I consider it to be the best Pokmon booster box to buy
Then you'll add that mana too - this is an essential for Spellslinger brews since it will trigger your Guttersnipes and such too, unlike dorks that recur
While Mew was a secret Pokemon, added last minute to Pokemon Red and Green by Shigeki Morimoto after bug-testing was concluded, Topsuns Pokemon cards were printed in 1997 after the existence of Mew became common knowledge