I dread to imagine a world where Urza was multiple colors when it's the worst to play against with just one
Many of its creatures are soldiers, clerics, and knights, and its spells focus on increasing the health and the attack of your minions (also known as buffs) or healing them (or yourself) instead
If some other player has some engine out that doesnt involve creatures, they love this plane and want to stay here forever while everyone else is scrambling to roll the planar die as fast as they possibly can
Digital-only cards have a big implication for MTG: Wizards of the Coast is not interested in maintaining parity with the paper version of the game anymore
It's hard to determine how well this card will do, but there is substantial amount of support for these types of cards, so it could go either way
One solution is to equip Skullclamp to an Elf and chump-block with it since creature tokens are often expendable