This rule was clearly added to prevent players from gaining too much advantage in having more resources in hand than the other players, and so this rule can often be seen as a downside since you are losing cards due to a simple yet sometimes unavoidable rule
Nice pair, right
Commanding Conclusion Lord of Atlantis (Secret Lair) | Illustration by Gabor Szikszai There are plenty of interesting and powerful merfolk commanders to build a deck around in Magic
Mana Acceleration and Cost Reduction : Staple mana rocks like Sol Ring, Arcane Signet, Sapphire Medallion, Thought Vessel, Basalt Monolith, Cloud Key, and Forsaken Monument ensure we have the mana acceleration and cost reduction to cast our spells efficiently
For example, if a creature has three +1/+1 counters on it and two -1/-1 counters are put on it, state-based actions will remove two of each of those kinds of counters, leaving the creature with just one +1/+1 counter
First and foremost, as treasures produce mana of any color, this provides a deck with great mana fixing