Vial of Souls3W
Artifact
Whenever you gain life, you may put that many soul counters on Vial of Souls. 3W, T: Remove all soul counters from Vial of Souls. Return target creature card, with converted mana cost equal or less to the number of soul counters on Vial of Souls, from your graveyard to the battlefield.
Spell Cancel1UU
Instant
Counter target spell. If you have no cards in your hand, draw a card.
I fiddled a little with "if ... otherwise" but it was either too complicated or just not worth it.
Aether Renewal1WU
Instant
Return target nonland permanent to its owner’s hand. You gain life equal to that card’s converted mana cost.
The first idea that I had was something along the lines of "softer silence", give you life if your opponent plays spells. But that was too weak, not very interesting.
Counter it1UU
Instant
Counter target spell. If this is your turn, Counter it costs 1 less to cast.
Call to War2RR
Enchantment
Whenever you cast an instant or sorcery spell, creatures you control gain +2/+0 and haste until end of turn.
It started as another enchantment that has a trigger, you cast spells and it deals damage to some target. But that already exists in many forms, so I changed it to creatures and combat.
You draw, I draw2U
Enchantment
Whenever another player draws a card, you may pay 2U. If you do, draw a card.
Genocide1WB
Sorcery
Destroy target creature and each other creature with the same converted mana cost and/or color as that creature.
Flavourfully, it's close to Extinction. Before posting I thought about splitting color and mana cost as two options to choose from, but that makes both options too narrow. As it is it has the slight disadvantage of not being able to hit targets with hexproof.
Vial of Souls is cool! Probably could even cost a bit less.
The rest seem reasonable enough. I like the situational cantrip on Spell Cancel, and Call to War is simple but nice.
Vial of Souls: ..."Return target creature card from your graveyard to the battlefield with converted mana cost equal to or less than the number of soul counters removed in this way."
Spell Cancel: The second sentence should be on a separate line and read "Then, if you have no cards in hand, draw a card."
AEther's Renewal: Considering Boomerang exists, this could probably bounce land as well, especially b/c you won't get the extra benefit of life from it.
Counter It: Should read "~ costs 1 less to cast if it's your turn." Also, i like this card immensely.
Genocide: Being able to hit creatures with the same CMC seems cool, but i think hitting creatures with the same color is too strong for that cost.
Dahammer4
Artifact - Equipment (R)
Choose one - Equipped creature gets +4/+0; or Double Strike; or "When this creature deals combat damage to a creature, exile that creature"; or t, unattach ~ from this creature: ~ deals 5 damage to target creature." t: Equipped creature gains flying until end of turn.
Equip 3
Dahammer has some good points about the wording but I figured would throw this out there as well:
For Vial of Souls, the suggested wording above by Dahammer and your initial wording where the counters are removed during resolution don't work together.
I think you should remove the counters as part of the cost. It would require the ability to be worded lightly differently but it currently allows the ability to be countered using something like Vampire Hexmage or Hex Parasite. On the other hand, your current wording kind of protects against getting the ability countered via Disallow or Stonecloaker since the player never removes the counters in those situations so they are fee to activate it again next turn.
If you like it how it is now, I would move the removing counters to the end of the ability. So,
"return target creature card.... Then remove all counters from ~".
This is more for clarity than anything else. Since you technically do things in order, you are actually removing the counters before returning the creature. It doesn't change the functionality, but I think it reads better.
Artifact
Whenever you gain life, you may put that many soul counters on Vial of Souls.
3W, T: Remove all soul counters from Vial of Souls. Return target creature card, with converted mana cost equal or less to the number of soul counters on Vial of Souls, from your graveyard to the battlefield.
Spell Cancel 1UU
Instant
Counter target spell. If you have no cards in your hand, draw a card.
I fiddled a little with "if ... otherwise" but it was either too complicated or just not worth it.
Aether Renewal 1WU
Instant
Return target nonland permanent to its owner’s hand. You gain life equal to that card’s converted mana cost.
The first idea that I had was something along the lines of "softer silence", give you life if your opponent plays spells. But that was too weak, not very interesting.
Counter it 1UU
Instant
Counter target spell. If this is your turn, Counter it costs 1 less to cast.
Call to War 2RR
Enchantment
Whenever you cast an instant or sorcery spell, creatures you control gain +2/+0 and haste until end of turn.
It started as another enchantment that has a trigger, you cast spells and it deals damage to some target. But that already exists in many forms, so I changed it to creatures and combat.
You draw, I draw 2U
Enchantment
Whenever another player draws a card, you may pay 2U. If you do, draw a card.
Genocide 1WB
Sorcery
Destroy target creature and each other creature with the same converted mana cost and/or color as that creature.
Flavourfully, it's close to Extinction. Before posting I thought about splitting color and mana cost as two options to choose from, but that makes both options too narrow. As it is it has the slight disadvantage of not being able to hit targets with hexproof.
The rest seem reasonable enough. I like the situational cantrip on Spell Cancel, and Call to War is simple but nice.
• Recent Card Ideas • My Drawings at DeviantArt
Vial of Souls: ..."Return target creature card from your graveyard to the battlefield with converted mana cost equal to or less than the number of soul counters removed in this way."
Spell Cancel: The second sentence should be on a separate line and read "Then, if you have no cards in hand, draw a card."
AEther's Renewal: Considering Boomerang exists, this could probably bounce land as well, especially b/c you won't get the extra benefit of life from it.
Counter It: Should read "~ costs 1 less to cast if it's your turn." Also, i like this card immensely.
Genocide: Being able to hit creatures with the same CMC seems cool, but i think hitting creatures with the same color is too strong for that cost.
Sigpic by Rivenor
Artifact - Equipment (R)
Choose one - Equipped creature gets +4/+0; or Double Strike; or "When this creature deals combat damage to a creature, exile that creature"; or t, unattach ~ from this creature: ~ deals 5 damage to target creature."
t: Equipped creature gains flying until end of turn.
Equip 3
Courtesy of Crepes
[OMC] Omerium's Collapse
For Vial of Souls, the suggested wording above by Dahammer and your initial wording where the counters are removed during resolution don't work together.
I think you should remove the counters as part of the cost. It would require the ability to be worded lightly differently but it currently allows the ability to be countered using something like Vampire Hexmage or Hex Parasite. On the other hand, your current wording kind of protects against getting the ability countered via Disallow or Stonecloaker since the player never removes the counters in those situations so they are fee to activate it again next turn.
If you like it how it is now, I would move the removing counters to the end of the ability. So,
"return target creature card.... Then remove all counters from ~".
This is more for clarity than anything else. Since you technically do things in order, you are actually removing the counters before returning the creature. It doesn't change the functionality, but I think it reads better.