Particularly in Mono-Red, card advantage is still shallow relative to other available card pools, but this is where Red can really shine
Of note, there are cards that have two Booster Fun treatments for the same card
Once transformed, it becomes Polukranos, Engine of Ruin, which is a 6/6 with reach and lifelink and reads: Whenever Polukranos, Engine of Ruin or another nontoken Hydra you control dies, create a 3/3 green and white Phyrexian Hydra creature token with reach and a 3/3 green and white Phyrexian Hydra creature token with lifelink. Even without any other hydra creatures, the fact this card will split into two is amazing - but with some clever deckbuilding, it could make your deck unkillable
Each artifact you tap after youre done activating mana abilities pays for .) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle
Hexdrinker exists in a similar space because spending mana to level it shouldnt come at the cost of casting more creatures