cacnea pokemon card (46/108) [Power Keepers] – Plug Colorless Artist Cacnea 005/198 - Reverse Holofoil

As has been established when discussing Bolass Citadel, paying for cards with life is an incredibly powerful effect

This one looks pretty innocuous, but I think may become a pretty decent player in Black decks that make use of a lot of counters

First of all, if thats the play pattern youre looking for, run Volo, Guide to Monsters

To fuel these plays, youll need a stable mana base

Miraidon is also a strong attacker, especially combined with Regieleki VMAX as hinted above but its attack requires three Energy

Plus, the modern take on this effect, Xanathar, Guild Kingpin, is even MORE expensive to cast (probably thanks to color fixing and the ability to see more cards)