The Amber/Emerald aggro deck focuses on playing aggressive creatures while comboing with Tramp Street-Smart Dog to help fuel Chernabog Evildoer
As such, the bottom line is that current fake cards are extremely unlikely to pass through the hands of a long-time Magic player without being detected but may fool newer players, and the best of the current counterfeit cards are very likely to pass unnoticed through tournaments, especially when double-sleeved and only seen from across the table
Check card sets by hovering over the card and looking in the bottom right-hand corner
Once it lands, Tyrranax Rex has ward 4 and haste, meaning it is attacking as soon as it comes down, and even if your opponent wants to stop it, your opponents are going to be taxed to oblivion to resolve the spell
Lastly, there's an entire section on rules in magicthegatering.com's Magic Rules Center, which includes links to pretty much any rules resource you could imagine and then some