Let's try something :
Enchant world (could be classic enchantment but i like the flavour of it)
- Any static or triggered ability that has 'sacrifice' in its effect should be read as if there was no sacrifice to be done and the ability will resolve as if the sacrifice had been done.
- Any activated ability that has 'sacrifice' in its cost can't be activated.
I am very bad at wording so it could be obviously improved. However, the goal here is to promote some new strategy while hurting a few other ones as a side-effect. Namely :
I can't find any vintage playable card that fits the first ability of that card so i guess it won't produce overpowered effect but it may make some new cards vintage playable. The most obvious synergy is with cards such as ball lightning and similar cards (that happen to be mostly red). I could not look at every card but maybe some obscure card could become a combo.
The second ability hurts quite a lot of cards but if we look only at vintage playables the main targets are ravager and fetchlands. In that way, this card is not so far from blood sun.
Basically it could enhance blood moon decks while putting some nice restrictions on blue and shop decks (by the way, shop decks have no easy way to deal with enchantment).
Maybe i missed some importante card and this could lead to overstrong effect because sacrifice is usually a strong way to reduce card power.