Since it costs three mana and suspends with three time counters, you generally wont be able to cast Inevitable Betrayal until turn six in most cases, but thats still fine depending on which card you get from your opponent
The most important part of your game plan is to grow your board
There are many ways to check for counterfeiting on the market (differences in printed color, examining the print with a magnifying glass, difference in weight, passing through strong light, bending test, etc
A quick Google search doesnt yield an obvious, definitive first oversized Magic card
Commanders Sphere is generally considered the baseline: it only taps for one mana, but its one mana of any of your decks colors, and you can always sacrifice it to draw a card
I also pulled an Alice Growing Girl from my Trove