I believe that this objection is easily defeated by noting that playing against Seismitoad or even Vileplume is can be done in the deck building stage
Rediscovered childhood memories or the fruit of a long search to achieve a goal: two ideal reasons to encapsulate your cards and show them off to their best advantage
Mire in Misery and Feed the Swarm were the first attempts at doing this, and while some people believe its against the philosophy of the color pie, I see it more as Magic evolving and adapting to the needs of the game after sticking around for more than 30 years
Nightmare-Eyes Restrict Level 1 DARK Illusion Fusion Effect Monster ATK/ 0 DEF/ 0 2 monsters with different Types (Fiend, Illusion, Spellcaster) You can only use the (1)st effect of this cards name once per turn
When Splitting Slime becomes monstrous, you get to put a copy of it onto the battlefield, only this copy doesn't have the Monstrous ability, nor does it have the +1/+1 counters from activating the originals Monstrosity ability