Rune Replacements for Waterwalking and Zombie Ward in ARAM

There are only two Runes that can't be chosen in ARAM (I think), Waterwalking and Zombie Ward. Others are a bit iffy but let's focus on those two for now. I tried to come up replacements that either fulfill a niche or just seem fun.

Waterwalking --> Poro Rider: After casting the Dash Summoner Spell or using a Poro Snax, gain 25 bonus Movement Speed and [5 -- 30 based on level] Ability Power or [3 -- 18 based on level] bonus Attack Damage for 5 seconds, adaptive.

Since Scorch covers the people who poke from afar, the replacement should be for those who have to engage to unload their damage. It might make some people take splash Sorcery over Triumph. If you didn't take the Snowball, you get Scorch instead.

Zombie Ward --> Poro Possesion: After dying, take control of a nearby Poro for 8 seconds. As a Poro you have True Sight (500 range), can cast Summoner Spells and can collect Health Shrines to heal the first allied champion you come near. Allied champions can feed you Poro Snax to give you a burst of Movement Speed and prolong your stay.

I tried to come up with something that covers Vision but doesn't overlap with Ghost Poro. This is the result. It seems like a fun idea to be able to play as a Poro. You basically run around revealing enemies, steal Health Shrines with the help of friendly Poro Snax and kill enemies with Snowballs or Ignite. A little speech bubble with your champion portray could reveal that you aren't a normal Poro.

If it's too fun in testing you could nerf it to only running around and revealing enemies.

Champions like Sion, Karthus and Kog'Mow wouldn't be able to take this Rune like how Cassiopeia can't take Slightly Magical Boots.