Although the FF limited is generally strong, the advantage is that it can be beaten by heel and stats in many FF environments that are often attacked in two turns and attacked in three turns
Before we go any further, however, a quick decklist: Creatures (34) 4 Lovestruck Beast 4 Questing Beast 4 Yorvo, Lord of Garenbrig 4 Syr Faren, the Hengehammer 2 Nylea, Keen-Eyed 3 Kogla, the Titan Ape 2 Ashaya, Soul of the Wild 4 Tangled Florahedron 3 Old-Growth Troll 4 Kolvori, God of Kinship Lands (21) Spells (5) As proof of concept, heres a Mono-Green Legends deck that exactly meets the suggested nineteen legendary creatures
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Walking Ballista enters the battlefield with X +1/+1 counters
While Rogue is not more powerful than Pia and Kiran Nalaar, the activiated ability (and only difference bar the cost to the cards) being no mana and instantly useful makes it have greater impact in cube, simply through happening sooner and more often