Kitsa, Otterball Elite is a wonderful inclusion for Kess
There are all kinds of potential synergies with indestructible, especially with spells that add it on around
About The Design: Magic: The Gathering is a collectible and digital collectible card game created by Richard Garfield
Since most of them are resource-heavy the suggested number is somewhat low, but if you can add more without hurting your mana curve (and your wallet since low mana ones are pricey) and consistency (for the alternate win conditions) everything more is a bonus
For instance, you pay an extra mana for the Beck half of Beck // Call compared to Glimpse of Nature, the Breaking half of Breaking // Entering mills two fewer cards than Glimpse the Unthinkable, the Burn half of Turn // Burn is one mana more than a Shock, Tumble of Rough // Tumble is worse than Pyroclasm, and so forth