The answer lies in one of Magics most fundamental concepts, the stack
If you don't control both Fang and Vanille at that time, the ability won't resolve, you won't have the opportunity to pay , and none of the ability's other effects will happen
Weve already mentioned both Thorough Investigation and Tireless Tracker, both of which are big wins when youre sacrificing clues that theyre making anyway too
Why are blue cards considered the control color
FAQs What is the best card in Lost Origin
This is just the natural progression of number and land drops, but if you make a 3/3 Shark and they make a 4/4, 5/5, or even 6/6, its relatively easy to still trade Shark-for-Shark if you find a second Typhoon and double block