For example, when Boon-Bringer Valkyrie enters the battlefield, you can either put a +1/+1 counter on Boon-Bringer Valkyrie itself, or you can put a +1/+1 counter on another creature and have that creature gain flying, first strike, and lifelink until end of turn
Besides, its always good to have some copies of them available, just in case
But, there could be instances where the ability could be enough to win you the game or remove a tricky threat if required
Two damage on turn one is nothing to sniff at, and, if you continue to develop your board on curve, you may well have the game sewn up long before your opponent can even play those extra lands youve given them
It would have been fair, as it would have been something for the other player to calculate into their overall costs of getting rid of the problem player at the table