Get ready to overwhelm the table with synergy and style
As I mentioned before, things are more complicated than this when you consider cantrips, card advantage, and such, but this should give you a good start for making sure you have the right number of lands in your deck
310.4b A battle has the intrinsic ability This permanent enters the battlefield with a number of defense counters on it equal to its printed defense number. This ability creates a replacement effect (see rule 614.1c)
#5 1st Edition Shadowless Base Set Venusaur This card is relatively rare, with only 138 PSA 10s in circulation
Card not found (New Phyrexia (2011)) smells like MaRo, because its actually a pretty good wincon in a limited Infect deck
You need to be sure that being guaranteed to hurt your chances is still better than cutting one of the cards you're thinking about