These cards are instead expensive because of their extreme scarcity
In a game, the split card will have the mana cost of both the cards combined , except for when it is on the stack , where it will only count for the mana cost of the half that is being cast
Green has several of these creaturefall card-draw effects, like Beast Whisperer or Guardian Project, which are fairly common in Commander
In terms of strategic flexibility, Jadelight Constrictor is worse than Nissa Constrictor, but does that mean that Jadelight Constrictor is a worse deck than Nissa Constrictor
But you can regularly get away with hands that have no plays until turn three or four and not end up too far behind on life
This feels a tad underpowered to me, but it might play much better than it looks, especially since it helps you cast higher-cost spells faster than normal