Just want to chime in on this.
If you want to dynamically hide/show elements, you can use the DOMs api for this.
<ion-card [hidden]="shouldHide">
<ion-card-header>
Card Header
</ion-card-header>
<ion-card-content>
Hello World
</ion-card-content>
</ion-card>
And then somewhere in the class, shouldHide is a true/false value.