Theres that person at your LGS who not only overtunes their decks for your local meta while pubstomping noobs or throwing in infinite combos despite the typical rule 0 talk (or maybe in spite of is actually correct for once)
Energy symbols - on fake cards, the small, circular energy symbols are often the wrong size or design, or in the wrong position
The Retreat Cost of the Pokemon this card is attached to is [Colorless][Colorless] less
I think its important to buy cards that resonate with you
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
Milling, discarding, or sacrificing lands grow your slime, and you can trade in +1/+1 counters to protect Slogurk by bouncing it to your hand