Im actually not opposed to spending Stonecoil Serpent as a free +2/+2 on Bloodsky Berserker
However, it also makes each opponent lose one life whenever a creature you control dies, and whenever a creature an opponent controls dies, you get to gain one life
This can help you accumulate the cost needed for Hyper Beam, which does 50 damage and lets you flip a coin to see if you can discard one of your opponents Energy cards.
None of these cards have a regulation mark on them, and they are designed so that various cards can be used together as one deck, transcending the boundaries of the current Standard Regulations, Extra Regulations, and Hall of Fame Regulations
However, The Pokmon Company has set up a very straightforward web page, which can be easily accessed via any conventional search engine
Its me, Im one of those players