(This includes manifest, disguise, cloak, morph, and a few older effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield
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"Or less." If you control just it, then you cannot drop a lesser drop, just a three-drop
A 2/4 is pretty mediocre for four mana in this day and age, and its ability seems very non-tricky because it is always face-up on the table
You can even use Tetsuko Umezawa, Fugitive to make your whole board unblockable