[9] The classic example is Krenko, Mob Boss
Casual isnt much of a descriptor, and a number on a scale of one to ten is devoid of almost all useful information (plus, every deck is described as a seven)
This card basically reads, draw your entire deck and then you should have the stuff to win
In the context of the Commander precon to which it belongs, this card is expectedly tailor-made to trigger the commander's ability
There are plenty of other cards that synergize with Grists ability, Izoni, Thousand Eyed gives you insect tokens for each creature in your graveyard, and Kessig Cagebreakers do the same but with 2/2 wolf tokens
If Elenda is dealt damage at the same time that you gain life (most likely because it dealt combat damage to a creature blocking or blocked by it), and your life total becomes greater than one of the listed values, apply the effect of its last ability before considering whether the damage is lethal