The illustrators working on the cards seemingly had a soft spot for Raichu as it is otherwise hard to explain how much beautiful art this thing has
When it enters, it can exploit a creature, and it grants that ability to all your other legendary creatures, which is wild
The biggest downside here is if an opponent wipes the board, you not only lose your board state, but your draw engine
Social media and technology-related words of caution aside, the printing of these cards will have an impact on Moderns metagame
This cements why removal like Path to Exile, Abrade, and even the due-for a kindred reprint, Rootgrapple are so important over an otherwise flexible card in Bramblecrush
Once you cast Ghalta, Stampede Tyrant, you can put all of those accumulated creature cards onto the battlefield without paying their mana costs along with it