Exava, Rakdos Blood Witch Rakdos cleric witches is an interesting road to go down, but at least Exava, Rakdos Blood Witch has a lot of text going for it
(Fusion/Ritual Monsters) Fusion monsters can only be played by fusing 2 or more monsters together with a Magic card that has the effect to do so (like polymerization)
They are not tournament-legal and are not recognised by collectors
Aside from certain Traps that can be activated from the hand (Infinite Impermanence, the Dominus duo, and so on), Traps are generally regarded as "too slow" in the Yu-Gi-Oh
Not only are they vulnerable to removal, but spending an entire turn waiting to use an effect can be such a loss of tempo that it leads to losing the duel entirely
We've already noted that this card can be used in a life-drain infinite combo when paired with another card that triggers upon life-gain