Part of what makes Elenda such a problematic creature is the fact that after damage is dealt to creatures and players, state-based actions are checked to determine which permanents should leave the battlefield
Its very easy to hit something with Bear Down, and in the case of this card even hitting a token of some kind is acceptable, because you dont use up an entire card to do it, since later in the game you get an efficient creature that is hard to block
A creature's mana value is determined solely by the mana symbols printed in its upper right corner (unless that creature is the back face of a double-faced card, is a melded permanent, or is copying something else
Late Plays Clarabelle Light on Her Hooves can shift on Clarabelle Clumsy Guest for 5 Ink, having her on the board on earlier turns
These cards just sacrifice permanents, while some sacrifice payoffs are outlets as well