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Dragon Fodder and Krenkos Command are functionally identical: Each sorcery produces two 1/1 Goblin tokens for two mana

Eternal formats like Legacy and Vintage also encourage lower land counts due to just how low the mana curves of those decks can get

Mana Leak (7) and Memory Lapse (7) and even Unsubstantiate (7) are likely all better than Actual Counterspell (6.5) as colour intense spells are often pretty uncomfortable

Companies producing card protection sleeves and storage accessories can create universal products supporting multiple games simultaneously

*Yes, Temporal Isolation is close, but first, it was from Time Spiral, and secondly it works on an attacking or blocking creature

As far as what a "Ring" card could be, there are a number of Ring cards that already exist in Magic (Sol Ring, Rings of Brighthearth, etc.)