Rating: 3/5 Flora - Good Fairy Flora is a 3-cost 2/4/1 with what I guess you could call "reverse challenger"
However, effects that prevent cards from entering the graveyard, like Leyline of the Void, dont count since cards never reach the graveyard in the first place
Lucario is preparing a powerful punch to direct at the Mega Venusaur opposing it across the battlefield
Sure, he costs the controller some life when he deals damage, but if you manage to transform him you are likely to get that life back and apply even more pressure
The theme showcases less graveyard synergy than what we have come to expect from the color combination but brings back some focus on +1/+1 counters
Some cards also have to sacrifice a land as part of their abilitys activation cost, such as [c]Sylvan Safekeeper[/c] to give a creature shroud for the turn