Call of the Ring adds a card-draw effect to re-assigning a creature as the Ring-bearer, at the cost of two life
Figure may be grown (or shrunk!) at instant speed which is significantly more convenient than other levellers however the increments of cost increase meaning you can't physically reach higher levels without all the mana to do so in one go making it a worse mana sink
They are both good cards, but you have several discard effects already
Etherium Pteramander If affinity works in Modern and uses black, this can basically be a 5/5 flier for 2 black mana
The reprints in the 30th Anniversary Edition will match the in-game rarity of the original cards in 1993 - meaning no mythic rares - apart from Sol Ring, which gains an additional unique anniversary edition
The idea behind Bloodrush was to have a creature card that could, for a lower casting cost, be discarded and used as a temporary buff for an attacking creature