Flash Foliage

The timing window is the whole trick: this can only be cast during combat after blockers are declared, which means the Saproling it makes arrives as a blocker the attacker never had a chance to play around. The attacking player committed to swinging into an open board, watched no blocks materialize, and then a 1/1 appears mid-combat already assigned to wall something. That sequencing turns a fog-adjacent effect into something sharper. A token born blocking skips the entire declare-blockers step it would normally have to participate in, so it can wall an attacker that had no legal blockers, sit in front of menace that already cleared the legal-block check, or simply trade with a small creature while replacing itself. The cantrip protects against the dud draw when combat goes quietly: even a chump-block that buys one turn and one point of toughness still draws, so the floor is a cheap green replacement effect with upside stapled on. Surprise blockers are a thin design seam, and most cards that occupy it ask you to flash in a creature and pay full freight for the body. This one collapses the flash creature and the card draw into a single instant that only functions inside the one window where a defender is worth the most: after the attacker has already declared, and committed, and assumed nothing was coming.